John Walker (naturalist) Totally Explained

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John Walker (1730–1803) was Professor of Natural History at the University of Edinburgh from 1779 to 1803. He was a protege of the chemist William Cullen and a colleague of Dugald Stewart, Joseph Black and several other Edinburgh professors who shaped the intellectual milieu of the Scottish Enlightenment. During his long career, he became a distinguished chemist, botanist, mineralogist and geologist, as well as being a minister in the Church of Scotland. He was a founding member of the Royal Society of Edinburgh. He was elected as Moderator of the General Assembly of the Church of Scotland in 1790. Many of his students went on to become leading scientists in nineteenth century Scotland, England, Ireland, and America.

Early life

Born in Canongate, Edinburgh to a schoolmaster father, he matriculated at the University of Edinburgh in 1746. Like many aspiring men in Scotland at this time, he took a divinity degree in 1749. He was soon ordained into the Church of Scotland (Presbyterian) and spent the next thirty years as a parish minister. However, his duties didn't stop him from pursuing scientific subjects in his spare time. Whilst at university he'd taken natural philosophy courses and had collected natural history specimens in and around the Lothians. During the 1750s he continued to pursue scientific subjects by studying chemistry under Prof. William Cullen and by joining Edinburgh's Philosophical Society. He distinguished himself not only by winning awards from the society but also by publishing an article in the 1757 edition of the Philosophical Transactions of the Royal Society of London. Under Cullen's patronage, Walker further distinguished himself as a chemist and a mineralogist and this led him to function as a scientific advisor for Lord Bute, Lord Hopetoun, Lord Cathcart, and Judge Advocate Lord Kames.

Becoming a naturalist

During the 1760s he used his aristocratic connections to tour mines throughout the Lowlands and to assemble his own sizable mineralogical collection. By the mid 1760s, Walker was known as one of Scotland's leading lay naturalists. This motivated the Church of Scotland and the Board of Annexed Estates to send him on exploratory tours of the Highland and Hebrides in 1764 and 1771. These tours allowed him to make religious and ethnographic observations for the church and to take scientifically oriented notes on northern Scotland's minerals, plants, animals, and climate. During the 1770s Walker published articles in the Scots Magazine and the Philosophical Transactions. By the mid part of the decade, it became clear that Robert Ramsey, the University of Edinburgh's ailing Professor of Natural History, would soon need to be replaced. After securing the support of William Cullen, Lord Kames and several other politically savvy intellectuals, Walker competed against William Smellie, a well respected natural historian and influential publisher, for the post. After much wrangling, Walker won the contest and was appointed in 1779. He held the position until his death in 1803.

Later life

Walker's natural history lectures spanned the academic year and were divided into two sections. The first half of the year he gave his 'Hippocratean' lectures, that is, meteorology, hydrology and geology. The second half of the year was devoted to the three kingdoms of nature: minerals, plants, and animals. During the 1760s, he'd accepted Linnaeus' binomial classification system and during his university tenure he readily applied it to botany. However, he didn't agree with Linnaeus' classification of minerals and animals and therefore he developed his own unique system for both of these subjects. Throughout his entire career he kept his ties with the Kirk and in 1790 he was elected to be Moderator, its highest position. Sometime in the late 1790s he began to lose his sight and several of his lectures were taken over by Dr Robert Jameson, a physician and former student who had also studied in mainland Europe. By the time that he died in 1803, Walker had taught well over eight hundred students, some of whom would go on to have a significant impact on nineteenth century natural history. Some of these names include Rev. Prof. John Playfair, Sir James Edward Smith, Sir James Hall, Mungo Park, Robert Waring Darwin, Robert Brown, Thomas Beddoes, Thomas Charles Hope, and Samuel Latham Mitchell.

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