"The Daguerreotype process the first 

 'practical' method of taking pictures by the 

 chemical action of light was invented by 

 Daguerre and Niepce in France and made 

 sensitive enough for taking human portraits 

 by Dr. Draper of New York, 1840. 



This 'Daguerreotype' was taken with elec- 

 tric-arc-light, at the instance of Professor B. 

 Silliman, Jr., in 1850 or 1851 by a New Haven 

 photographer in the Yale College Laboratory 

 in, I think, the summer of 1851 



S. W. JOHNSON, Jan. 1897." 



