Microscopes of Powell, Boss, and Smith. By E. M. Nelson. 437 



objective as a copy of a Continental one, and his 1833 objective as a 

 copy of Tulley's. The triple front, fig. 117, was undoubtedly due to 

 Mr. J. J. Lister. 



Fig. 120. 



Mr. Wenham, writing * in 1869, claims to have been the inventor, 

 about the year 1850, of the single front ; but in an article written by 

 him for the third edition of Quekett in 1855, he does not even mention 



* Man. Micr. Journ., i. (1869) pp. Ill, 170. 



