CHILDHOOD AND YOUTH 47 



young lady friends of the town and other young people, 

 in the natural and appropriate amusements of his age. 



In September he visited Philadelphia and for the most 

 part frequented the Academy, where he met for the first 

 time some of the better known scientists of the day, 

 Townsend Brydges, Dr. Samuel G. Morton 8 the anthro- 

 pologist, and Thomas Nuttall. 9 On the 2Qth he went to 

 the newly established Daguerreotype parlors and had his 

 picture taken. Shortly after he returned to Carlisle. 



The application of electricity to the cure of certain 

 ailments was already in vogue, and with the electric 

 machine borrowed from the college he made appli- 

 cations of it to several rheumatic friends. In Novem- 

 ber he was experimenting with bichromate of potash 

 prints, better known nowadays as "blueprints," and 

 common in every office where plans or drawings are to 

 be copied. This was then a new thing and he applied 

 it to taking prints of the leaves of as many trees and shrubs 

 as the neighborhood afforded. This collection of prints 

 many years afterward was utilized with profit by the 

 palseobotanists of the National Museum for comparison 

 with fossil plants. 



8 Samuel George Morton, M.D., proficient in geology and craniol- 

 ogy, born in Philadelphia, Jan. 26, 1799, died May 15, 1851. He was 

 one of the most influential members of the Philadelphia Academy of 

 Natural Sciences and an active participant in the Lea-Conrad contro- 

 versy of 1832-3. He published important contributions to the Cre- 

 taceous paleontology of the United States and on human craniology. 



9 Thomas Nuttall, born in Settle, Yorkshire, in 1786, died at 

 Nutgrove near Liverpool Sept. 10, 1859. He was especially a bota- 

 nist, but collected in all branches of natural history. He came to the 

 United States in 1808, travelled and collected extensively on the 

 Pacific Coast and elsewhere and succeeded Peck in charge of the 

 botanical garden at Cambridge, Mass., in 1822; in 1842 he returned 

 to England. 



