222 



PHO TO-M1CROGRAPHY 



[CM. VIII 



S. Army Medical Museum. The photo-micrographs made by him and exhibited 

 at the Centennial Celebration at Philadelphia in 1876, serve still as models, and no 

 one could do better than to study them and try to equal them in clearness and 

 general excellence. According to the writer's observation no photo-micrographs 

 of histological objects have ever exceeded those made by Woodward, and most of 

 them are vastly inferior. It is gratifying to state, however, that at the present 

 time many original papers are partly or wholly illustrated by photo-micrographs, 

 and no country has produced works with photo-micrographic illustrations superior 

 to those in "Wilson's Atlas of Fertilization and Karyokinesis" and "Starr's Atlas 

 of Nerve Cells," issued by the Columbia University Press. 



In passing the writer would like to pay a tribute to Mr. W. H. Walmsley who 

 has labored in advancing photo-micrography for the last twenty years. His con- 

 venient apparatus and abundant experience have been placed freely at the com- 

 mand of every interested worker, ;and many a beginner has been helped over 

 difficulties by him. His last contribution in "International Clinics," vol. i. ser. 

 u, 12, is encouraging in the highest degree both for its matter and for the 

 illustrations. 



FIG. 183. Zeiss' Vertical Photo-micro- 

 graphic Camera. A. Set screw holding the 

 rod (S ) in any desired position. P, Q. Set 

 screws, by which the bellows are held in place. 

 B. Stand with tripod base in which the sup- 

 porting rod (S) is held. This rod is now 

 graduated in centimeters and is a ready 

 means of determining the length of the cam- 

 era. M. Mirror of the microscope. L. The 

 sleeve serving to make a light-tight connection 

 between the camera and microscope. O. The 

 lower end of the camera. R. The upper end 

 of the camera where the focusing screen and 

 plate holder are situated. (From Zeiss" 1 Photo- 

 m icrograph ic Ca ta log ) . 



As the difficulties of photo-micrography are so much greater than of ordinary 

 photography, the advice is almost universal that no one should try to learn photo- 

 graphy andtphoto-micrography at the same time, but that one should learn the 



