8 The Microscope. 



fociis, which quality makes the objective especially adapted to photo- 

 graphic work. A one-inch has recently been tested photographically, 

 with a distance of seven and one-half feet between the objective 

 and the image, and not a trace of the usual difference between 

 the visual and active foci could be found, and the resulting picture 

 was of unusual sharpness and brilliancy. 



EOCHESTEK, N. Y. 



DAVID SIMONS KELLICOTT, PH. D., F. R. M. S. 



PRESIDENT OF THE AMERICAN SOCIETY OF MICROSCOPISTS. 

 (With Portrait.) 

 LEE H. SMITH. 



I HE writer's acquaintance with the subject of this sketch dates 

 -*■ back to December, thirteen years ago, when, through the 

 instrumentality of Mr. Henry Mills, our local father of microscopy? 

 we wei'e introduced. Afterward, in the course of a conversation with 

 Mr. Mills, he remarked : " Prof. Kellicott piu'chased a microscope 

 about a year ago, and has made the most remarkable progress in its 

 study, and in its use as a means of investigation, of any one I have 

 ever seen." Previous to this time, the Professor had devoted his 

 time to teaching of science, and as a relaxation pursued the study of 

 our local botany and entomology; but since he began work with the 

 microscope, the results of his labors have been a wonderful example 

 of what painstaking investigation and original work can be done, 

 even when carried on by one apparently fully occupied by profes- 

 sional cares. 



It is unusual to find, in this day of eager money-making, a man 

 who, apparently casting aside all efforts for gain, devotes so much of 

 his leisure and income to scientific study. 



Among the valuable papers presented by Professor Kellicott to 

 the scientific world, we can mention but a few, collected at random 

 from a large number, all of which are of importance. 



Among those published in the Canadian Entomologist are : 

 " Obsei'vations on Several Species of ^geridse and Descriptions of 

 Ae. Pini," xiii, 3-8 ; " The Larvae of Catocala Unijuga," xiii, 38-9 ; 

 " Notes on vEgeria Pini," xiii, 157; " Psej^henus Le Contei — External 

 Anatomy of Larvae," xv, 191-8; " Ovipositing Apparatus of Nonagria 

 Subcamia," xvi, 170; "Eumacuria Brunnearia," xvii, 32-8. 



In the Entomologica Americana: "Notes on the Larvae of 

 the Genus Catocala," ii, 45-6. 



