102 THE POPULAR SCIENCE MONTHLY. 



the trustees of the institution elected him as its president in 1864, 

 which office he still holds. Coincident with his accession to the presi- 

 dency of Columbia College, an important step was taken by the man- 

 agers of the institution for the promotion of scientific education by 

 the establishment of the School of Mines, and the appointment of an 

 able faculty to carry it on. This branch of the college has been so 

 well administered as to become a great success. Its facilities for sci- 

 entific training are ample and well directed, and in the number of its 

 students it is already the rival of the classical department. 



Di'. Barnard has written miich upon both scientific and educa- 

 tional topics, and done a good deal of important work in connection 

 with the various international expositions of industry, to which he 

 has been commissioned by our Government. His last important liter- 

 ary undertaking has been the editorship of Johnson's " New Illus- 

 trated Universal Cyclopaedia." He has received many honors from 

 institutions of learning and leading scientific societies, both in this 

 country and abroad, and has been President of the American Associ- 

 ation for the Advancement of Science, of the American Microscopical 

 Society, and of the American Institute, New York. The following 

 are President Barnard's most important publications : 



In the Journal of Science. 



1. Aurora Borealis, 1838. 



2. Improvement in Photography, 1842. (This was one of the earliest pro- 



cesses discovered for quickening the sensitiveness of Daguerre's iodized 

 plates.) 



3. Theory of Hot-Air Engine, 1853. 



4. Modification of Ericsson's Hot-Air Engine, 1853. 



5. Elastic Force of Heated Air, 1854. (A series of papers.) 



6. Comparative Expansion of Heat in Different Forms of Air-Engines, 1854. 



7. Mechanical Theory of Heat, 1854. 



8. Examination of the Theory which ascribes the Zodiacal Light to a Pdng sur- 



rounding the Earth, 1856. 



9. The Eclipse Expedition to Cape Chudleigh, Labrador, 1860. 



10. Hydraulics of the Mississippi, 1863. 



11. Explosive Force of Gunpowder, 1863. 



In the Proceedings of the American Association for the Advancement of Science. 



12. On the Pendulum, with Description of an Electric Clock with Pendulum 



perfectly free, 1858. 



13. On the Means of preserving Electric Contacts from Vitiation by the Spark, 



1859. 



14. Extended Eeport on the History, Methods, and Results of the American 



Coast Survey, 1859. 



15. On the Assumed Identity of Mental and Physical Forces, 1868. 



In the Reports of the Smithsonian Institution. 



16. The Mathematical Prmciples of the Undulatory Theory of Light, Svo, pp. 



133, 18G2. 



