Franz Junghuhn: The Naturalist Who Surveyed Java’s Volcanoes

Franz Junghuhn was a German-born physician and naturalist who spent most of his working life in the Dutch East Indies, studying the volcanoes, plants and landscape of Java. He arrived in Batavia in 1835 as a military doctor and used his spare time to travel, and the books he produced in the decades that followed made him one of the most important scientific observers of the island. For a visitor to West Java today, his name is attached to the highland country around Bandung, to the cinchona plantations that shaped the region’s economy, and to the volcanoes that dominate the skyline.

He is still remembered in the Netherlands and Germany as a figure who combined the eye of a traveller, the training of a doctor and the curiosity of a naturalist, and who was willing to climb a volcano to see what it looked like inside. The phrase that often attaches to his name, the Humboldt of Java, is a tribute to the way he set out to describe a whole landscape rather than a single species.

Franz Junghuhn and the making of a naturalist

Junghuhn was born on 26 October 1809 in Mansfeld, in what is now the German state of Saxony-Anhalt. He studied medicine at Halle and Berlin, and he published a paper on fungi in 1830 while he was still a student. That combination of medicine and natural history shaped his career in the Indies. A doctor in the tropics had to know the plants that might cure and the animals that might carry disease, and a naturalist had to be prepared to travel far from a laboratory. Junghuhn had both skills before he sailed for Java.

He reached Batavia in October 1835, where he took up a post as a military health officer in the Dutch colonial army. Batavia was the Dutch colonial capital on the north coast of Java, which is today Jakarta. The post gave him a base and a salary, but it did not confine him to the city. His journeys took him across Java and into parts of Sumatra, and he came back from each one with specimens, notes and sketches. Over time he became an expert on the island’s geology, its flora, its animals and the peoples who lived in its highlands.

The breadth of his interests is what makes his work hard to categorise. He worked as a botanist, a geologist, a volcanologist and a surveyor, and he moved between these roles depending on what a particular mountain or forest demanded. A visitor reading his books today will see a writer who could explain the form of a volcano in one paragraph and the plant life on its slopes in the next, because for him the two were parts of the same landscape.

Junghuhn and Java’s volcanoes

Junghuhn’s most distinctive contribution was his work on the volcanoes of Java. Java is one of the most volcanically active islands on earth, with a chain of cones running along its length, and in the nineteenth century the question of how those mountains had formed and what they had done to the land was still open. He published on the volcanoes of the Indian archipelago during his years in the Indies, and his observations of cones, craters and lava fields treated the volcanoes as part of a single system rather than as isolated peaks.

His larger work on the island appeared in the early 1850s. Under the title Java, its shape, its vegetation covering and its inner structure, he produced a treatise in four volumes, first in Dutch and then in German translation. The work covered the landscape from the coast to the summit, describing the forests and grasslands that clothed the slopes, the way the land had been shaped by fire and water, and the plants that grew at each height. Its breadth made it a foundation text for students of Java’s volcanology, botany and geography.

The book’s method is worth noticing. Junghuhn did not treat the island as a list of places but as a series of zones rising from the coast to the highest peaks. Each zone had its own temperature, rainfall and vegetation, and the zones were arranged by altitude as clearly as a set of steps. That way of describing a mountain island has become familiar to modern visitors, who see the forest change as they climb, and it was one of his lasting contributions to the way Java is understood.

The highland road: Junghuhn in West Java

West Java was one of the regions where Junghuhn spent the most time. The routes he followed in the highlands ran through country that is now crossed by the roads and railway between Bogor, Bandung and the volcanic uplands to the south. His travels took him through the forested slopes above Bogor, the cones around Bandung and the crater country of the Garut highlands. He is credited with discovering the crater lake Kawah Putih near Bandung in 1837, and he described the lakes and hot springs he found along the way.

Among the places he visited was the volcano Papandayan, near Garut. A visitor who climbs or drives into that crater area today walks through the same kind of steaming, sulphur-scented landscape that the early naturalists described, and it is one of the clearest places to see the volcanic processes that fascinated him. The crater still smokes, and the sulphur fields still tell the story of the volcano’s activity in colour and smell.

Bandung grew into the highland capital of West Java, and the cool air that drew Dutch planters and officials to it was part of the reason the region became a centre of plantation agriculture. Junghuhn’s descriptions helped show that the highlands were both more varied and more usable than the coastal lowlands, and the agricultural landscape of the Priangan uplands owes something to his survey work.

The cinchona story and the fight against malaria

The most important practical chapter of Junghuhn’s career concerned cinchona. The bark of cinchona trees is the source of quinine, the drug that was the main treatment for malaria in the nineteenth century, and malaria was a constant threat to colonial officials, soldiers and planters in the tropics. Europeans had brought cinchona from South America, and by the middle of the century the Dutch were trying to establish reliable plantations in Java to supply the drug.

The Dutch government commissioned the botanist J.K. Hasskarl in 1852 to collect cinchona plants and seeds in South America and bring them to Java. Hasskarl was the first to introduce cinchona cultivation on the island, and Junghuhn returned to Java in 1855 as an inspector of natural science investigations. From 1857, or possibly 1858, Junghuhn was put in charge of the cinchona work and settled at Lembang, a highland town in the hills north of Bandung. He took over plantings that were still being acclimatised, and the work was slow and technically demanding, because the trees had to be grown at the right altitude and the bark had to be harvested and processed in the right way.

The work also brought him into conflict with other scientists. The botanist Teijsmann and the cinchona expert J.E. de Vrij of Bandung disagreed with Junghuhn about which cinchona species were effective against malaria, and the dispute was carried on in public and in print. The argument was not simply personal. Different species produced different proportions of the active alkaloids, and the choice of species mattered for the quality of the medicine and for the profits of the plantations. The argument shows how colonial science was tied to commercial decisions, and how a question about a plant could carry economic and medical weight.

The Cibodas garden on the slopes of the Gede volcano shows how the cinchona programme grew. The garden was established in 1852, when Teijsmann planted cinchona there, and the garden expanded up the slopes toward the summits of Mount Gede and Pangrango. Later experiments helped make Java one of the leading producers of cinchona bark, and the garden is a living link between the highland experiments and the economic history of the island.

Later years and the end of his life

The strain of long expeditions and the effects of tropical life weighed on Junghuhn over the years. He remained in the Indies for most of his working life, and he continued to work on his Java books and on the cinchona plantations. His standing as a scientist was high, and the comparison with Humboldt that followed him for the rest of his life says a good deal about how his contemporaries saw his work. Both men tried to describe nature as a whole, in its climate, its altitude zones and its living forms, and Junghuhn applied that approach to a volcanic island that had been less studied than the continents.

He died at Lembang on 24 April 1864, having spent the greater part of his adult life in the Dutch East Indies. The books, specimens and plantations he left behind are the main ways he is still present on the island. A visitor who reads his work and then visits the highlands sees the landscape through the same zones he described.

Visiting the landscape Junghuhn described

For a visitor, the best way to read Junghuhn’s work is to climb through the landscape he described from the coast to the peaks. The highlands around Bandung are a good starting point, because the city sits in a basin ringed with volcanic peaks and the surrounding hills show the zones he wrote about. The tea estates that cover the slopes also reflect the shift from forest to plantation that his cinchona work helped to make possible.

The Cibodas botanic garden is the most direct link to the cinchona story. The garden lies high on the flanks of the Gede volcano, in the cool forest below the summit, and it holds the trees and plants that the highland experiments tested. Walking through it gives a sense of the altitude, the humidity and the variety of plants that Junghuhn had to understand before he could make any of his plantation decisions. The mountain above it, Mount Gede, is itself the kind of volcanic peak that his books describe.

The volcanic landscape around Garut offers a second kind of visit. The crater of Papandayan is an active place with steam vents and sulphur, and it is easy to see why a naturalist would find it fascinating. Visitors should take the advice of local guides and check the conditions before walking the crater, because the volcano is still active, and the landscape can change from one season to the next.

Why Junghuhn still matters to West Java

Junghuhn’s legacy is not one thing but several. He helped establish the scientific understanding of Java’s volcanoes and their landscape, he took part in the cinchona work that supplied medicine to the world, and he left descriptions of the island’s plants and terrain that remain useful to students and travellers. The highland country he studied is still one of the most attractive parts of West Java, and it still shows the zones he described.

For the modern visitor, the most useful lesson is that the landscape is a record of processes as much as a view. The cones and craters were made by volcanic activity, the forests change with altitude, and the plantations were built on the same slopes that the forests once covered. Junghuhn saw these connections before most of his contemporaries, and reading his work or visiting the places he described makes the highlands of West Java easier to understand.

He also shows the value of combining different kinds of knowledge. The doctor who knew the diseases, the botanist who knew the plants, the surveyor who knew the land and the volcanologist who knew the mountains all contributed to his work, and a visit to the highlands is most rewarding when it draws on all of those strands at once. That is a fitting way to remember a man who spent his life trying to see the whole of Java at once.

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