Aspects of nature, in different lands and different climates (Vol. 2 of 2) with scientific elucidations — Reading Companion

Physiognomy of Plants and the Limits of Vegetation

The first major essay, 'Physiognomy of Plants,' argues that the overall appearance of vegetation—its 'physiognomy'—is shaped by a few dominant plant forms. Humboldt catalogs these forms, from palms to conifers, and links them to climate and elevation. He notes, for instance, that the condor, 'the giant of the Vulture tribe,' soars above all Andean summits, at altitudes higher than the Peak of Teneriffe piled on the Pyrenees. The essay is less a systematic botany than a meditation on how plant forms create the visual character of landscapes.

Humboldt's method is comparative: he contrasts tropical Andean tree vegetation with that of the northwest coast of America and the Canadian lakes. He also cites Darwin and Claude Gay on similar patterns in the Southern Hemisphere, where Drymis winteri and forests of Fagus antarctica form uniform coverings along long north-south lines. The text is dense with references to elevation measurements in French and English feet, and to the work of other naturalists such as Leopold von Buch and Martins.

Volcanic Action and the Structure of the Earth

The second major section, 'On the Structure and Mode of Action of Volcanos,' shifts from plant geography to geology. Humboldt examines volcanic phenomena across the globe, drawing on his own observations in the Andes and on European examples. He is interested not only in eruptions but in the long-term structural effects of volcanic forces. The annotations and additions that follow each essay show Humboldt engaging with contemporary scientific debates, citing Göppert on the union of tree roots and Kunth on cambium growth.

One curious phenomenon he discusses is the ability of cut white pine stumps to continue adding wood layers for years, without leaves or shoots. Göppert attributed this to root grafting with a living neighbor; Kunth disagreed, comparing it to the enclosure of metal plates in growing trees. Humboldt presents both views without settling the dispute, reflecting his preference for posing questions over delivering final answers.

The Plateau of Caxamarca and Historical Geography

The volume closes with a descriptive piece on the Plateau of Caxamarca, the ancient capital of the Inca Atahuallpa, and the first view of the Pacific from the Andes. Here Humboldt blends physical geography with historical reflection, describing the landscape that framed the Spanish conquest. The text is less technical than the earlier essays, more narrative in tone, but still anchored in specific observations of elevation, climate, and vegetation.

This section includes its own set of annotations, where Humboldt adds notes on Inca roads, the cultivation of quinoa, and the distribution of Andean plants. The juxtaposition of scientific analysis with historical description is characteristic of Humboldt's approach: he treats the natural world and human history as interwoven, each illuminating the other. The volume ends with a general summary and an index, helping readers navigate the dense material.

Readers approaching this volume should be prepared for a work that moves freely between disciplines. Humboldt expects his audience to follow arguments that draw on botany, geology, and history within a single paragraph. The annotations are essential: they contain much of the specific evidence for his claims. Sabine's translation preserves the original's intellectual ambition, making this a valuable record of how nineteenth-century science sought to comprehend the natural world as a unified whole.

There’s a particular quietness in Humboldt’s way of tracing a mountain’s vegetation line, as if altitude were a kind of memory. I found myself thinking of that while revisiting the hurried, human diaries in Records of Journeys to Venice and the Low Countries — A Closer Reading. Different landscapes, both somehow asking the same patient question about what grows where we stand.