BIOGRAPHICAL SKETCH 



most difficult feats as a mountaineer. 

 His face was rather stern and strongly 

 marked, but the sharp features assumed 

 an exceedingly pleasing expression when 

 his sympathy was touched ; and the effect 

 was heightened by the quality of his 

 voice. His eyes were grey-blue, and his 

 hair, light-brown in youth, was abundant 

 and of very fine texture. He had gener- 

 ally, like Faraday, to bespeak a hat on 

 account of the unusual length of his 

 head. A medallion of Tyndall, executed 

 by Woolner in 1876, is, perhaps, the best 

 likeness that exists of him. 



Tyndall's works have been translated 

 into most European languages. In 

 Germany (where Helmholtz and Wiede- 

 mann undertook the translations and 

 wrote prefaces) they are read almost as 

 much as in England. Some thousands of 

 his books are sold yearly in America, and 

 a few translations have been made into 

 the languages of India, China, and Japan. 



In the Royal Society's catalogue of 

 scientific papers 145 entries appear 

 under Tyndall's name between 1850 

 and 1883, indicating approximately the 

 number of his contributions to the 

 Philosophical Transactions, the Philo- 

 sophical Magazine, the Proceedings of the 

 Royal Society and of the Royal Institu- 

 tion, and other scientific journals. A 

 great variety of subjects besides those 

 glanced at above occupied his attention. 

 They are for the most part dealt with in 

 the miscellaneous essays collected in 

 Fragments of Science and New Frag- 

 ments. The essence of his teaching is 

 contained in the following publications : 

 i. The Glaciers of the Alps, being a 

 Narrative of Excursions and Ascents, an 

 Account of the Origin and Phenomena 

 of Glaciers, and an Exposition of the 

 Physical Principles to which they are 



Related, 1860; reprinted in 1896; trans- 

 lated for the first time into German in 

 1898. 2. Mountaineering in 1861 : A 

 Vacation Tour, 1862 (mostly repeated in 

 Hours of Exercise). 3. Heat Considered 

 as a Mode of Motion, 1863 ; fresh 

 editions, each altered and enlarged, in 

 1865, 1868, 1870, 1875; the sixth 

 edition, 1880, was stereotyped. 4. On 

 Sound, a course of eight lectures, 1867 ; 

 3rd edit., with additions, 1875 ; 4th 

 edit., revised and augmented, 1883 ; 5th 

 edit., revised, 1893. 5. Faraday as a 

 Discoverer, 1868 ; 5th edit., revised 

 1894. 6. Researches on Diamagnetism 

 and Magne-crystallic Action, including 

 the Question of Diamagnetic Polarity, 

 1870; third and smaller edition, 1888. 

 7. Fragments of Science for Unscientific 

 People : A Series of Detached Essays, 

 Lectures, and Reviews, 1871 ; augmented 

 in the first five editions ; from 6th edit., 

 1879, in two vols. 8. Hours of Exercise 

 in the Alps, 1871 ; 2nd edit., 1871 ; 3rd 

 edit., 1873; reprinted in 1899. 9. 

 Contributions to Molecular Physics in 

 the Domain of Radiant Heat : A Series 

 of Memoirs published in the Philosophical 

 Transactions and Philosophical Magazine, 

 with additions, 1872. 10. TJte Forms of 

 Water in Clouds and Rivers, Ice, and 

 Glaciers (International Scientific Series), 

 1872 ; i2th edit., 1897. n. Six Lectures 

 on Light, delivered in America in 1872-3, 

 1873; 5th edit., 1895. 12. Lessons in 

 Electricity, at the Royal Institution, 1876; 

 5th edit., 1892. 13. Essays on the Float- 

 ing Matter of the Air in Relation to Putre- 

 faction and -Infection, 1881 ; 2nd edit., 

 1883. 14. New Fragments, 1892 ; last 

 edit., 1897. 15. Notes on Light: Nine 

 Lectures delivered in 1869, 1870. 16. 

 Notes on Electrical Phenomena and 

 Theories : Seven Lectures delivered in 

 1870, 1870. L. C. T. 



