414 PIONEERS OF SCIENCE IN AMERICA. 



to Boston. Here, although he early identified himself with the 

 educational and public interests of the community, he did not 

 relax his devotion to scientific labours, which were now, how- 

 ever, more largely directed to the department of experimental 

 physics. Among his contributions to physics at this period 

 may be mentioned a series of papers On Binocular Vision, 

 giving an Elaborate Analysis of the Phenomena, with some 

 Important Additions to the Researches on this Subject of 

 Wheatstone and Brewster ; Experiments on Sonorous Flames, 

 in which he described an apparatus for making visible the 

 vibrations by rotating the flame ; and On the Formation of 

 Rings of Air and Liquids all of which may be found in 

 Silliman's Journal (1855-1860). 



He also published, in the New Edinburgh Philosophical 

 Journal, the results of continued observations on atmospheric 

 ozone, and on the auroras of August and September, 1859 

 and 1860. As a member of the American Academy of Arts 

 and Sciences, and of the Boston Society of Natural History, 

 Prof. Rogers took an active part in the discussions of the 

 various scientific questions then rising into importance, and 

 made contributions from time to time to their published pro- 

 ceedings. Among the communications to the American Acad- 

 emy we may note papers On the Protozoic Age of Certain 

 Rocks in Eastern Massachusetts; On the Actinism of the 

 Electric Discharge in Vacuum Tubes, of which he exhibited 

 numerous photographs, in connection with his paper on the im- 

 provements, by Mr. E. S. Ritchie, of the Ruhmkorff apparatus; 

 and Experiments disproving, by the Binocular Combination 

 of Visual Spectra, Brewster's Theory of Successive Combina- 

 tion of Corresponding Points. 



In the Transactions of the Boston Society of Natural His- 

 tory appeared, among other articles by Prof. Rogers, commu- 

 nications On the Growth of Stalactites; Geological Relations 

 of the New Red Sandstone of the Middle States to the Coal- 

 Rocks of Eastern Virginia and North Carolina ; On the Origin 

 and Accumulation of the Protocarbonate of Iron in Coal Meas- 

 ures ; On the Natural Coke and Associated Igneous Rocks 

 of Eastern Virginia; and On Pebbles in the Newport Conglom- 

 erate. 



At the annual meetings of the American Association for the 

 Advancement of Science, Prof. Rogers was a frequent con- 



