It is on the authority of James Watt that Dr. Robinson is credited with having conceived the idea of driving carriages by steam power. Watt wrote as follows: "My attention was first directed to the subject of steam engines by the late Dr. Robinson, then a student in the University of Glasgow, afterwards Professor of Natural Philosophy in the University of Edinburgh. He, in 1759, threw out the idea of applying the power of the steam engine to the moving of wheel carriages, and to other purposes, but the scheme was soon abandoned on his going abroad." ERASMUS DARWIN Born at Elton, Nottinghamshire, England, December 12, 1731. Died at Derby, April 18, 1802. Having studied at St. John's College, Cambridge, and at Edinburgh, Darwin settled as a physician at Litchfield and gained a large practice. In 1781 he moved to Derby. He was a man of remarkable scientific attainments and a voluminous writer of poetry that was pervaded by enthusiasm and love of nature, but had little poetic quality. Darwin, wrote most of his poetry and evolved most of his ideas as he drove about the country in a doctor's covered sulky that was piled high with books and writing materials. He was in correspondence with Benjamin Franklin and Matthew Boulton about 1765 in regard to steam, and writing to Boulton, said: "As I was riding home yesterday I considered the scheme of the fiery chariot, and the longer I contemplated this favorite idea, the more practicable it appeared to me. I shall lay my thoughts before you, crude and undigested as they appeared to me, and by these hints you may be led into various trains of thinking upon this subject, and by that means (if any hints can assist your genius, which, without hints, is above all others I am acquainted with) be more likely to approve or disapprove. And as I am quite mad of the scheme, I hope you will not show this paper to anyone. These things are required: (1) a rotary motion; (2) easily altering its direction to any other direction; (3) to be accelerated, retarded, destroyed, revived, instantly and easily; (4) the bulk, the weight, the expense of the machine to be as small as possible in proportion to its weight." Darwin gave sketches and suggested that the steam carriage should have three or four wheels, and be driven by an engine having two cylinders open at the top, and the steam condensed in the bottom of the cylinder, on Newcomen's principle. The steam was to be admitted into the cylinders by cocks worked by the person in charge of the steering wheel, the injection cock being actuated by the engine. The "fiery chariot" never went beyond this suggestion, however. RICHARD LOVELL EDGEWORTH