Born in 1801, the son of a poor country pastor in Saxony, he lived from 1817 to 1887, when he died, seventy years therefore, at Leipzig, a typical _gelehrter_ of the old-fashioned german stripe. His means were always scanty, so his only extravagances could be in the way of thought, but these were gorgeous ones. He passed his medical examinations at Leipzig University at the age of twenty-one, but decided, instead of becoming a doctor, to devote himself to physical science. It was ten years before he was made professor of physics, although he soon was authorized to lecture. Meanwhile, he had to make both ends meet, and this he did by voluminous literary labors. He translated, for example, the four volumes of Biot's treatise on physics, and the six of Thénard's work on chemistry, and took care of their enlarged editions later. He edited repertories of chemistry and physics, a pharmaceutical journal, and an encyclopaedia in eight volumes, of which he wrote about one third. He published physical treatises and experimental investigations of his own, especially in electricity. Electrical measurements, as you know, are the basis of electrical science, and Fechner's measurements in galvanism, performed with the simplest self-made apparatus, are classic to this day. During this time he also published a number of half-philosophical, half-humorous writings, which have gone through several editions, under the name of Dr. Mises, besides poems, literary and artistic essays, and other occasional articles. But overwork, poverty, and an eye-trouble produced by his observations on after-images in the retina (also a classic piece of investigation) produced in Fechner, then about thirty-eight years old, a terrific attack of nervous prostration with painful hyperaesthesia of all the functions, from which he suffered three years, cut off entirely from active life. Present-day medicine would have classed poor Fechner's malady quickly enough, as partly a habit-neurosis, but its severity was such that in his day it was treated as a visitation incomprehensible in its malignity; and when he suddenly began to get well, both Fechner and others treated the recovery as a sort of divine miracle. This illness, bringing Fechner face to face with inner desperation, made a great crisis in his life. 'Had I not then clung to the faith,' he writes, 'that clinging to faith would somehow or other work its reward, _so hätte ich jene zeit nicht ausgehalten_.' His religious and cosmological faiths saved him--thenceforward one great aim with him was to work out and communicate these faiths to the world. He did so on the largest scale; but he did many other things too ere he died.