ch. m/} 



PHOTO-MICROGRAPH ) " 



219 



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 convenient apparatus and abundant experience have been placed freely at 

 the command of every interested worker, and many a beginner has been 

 helped over difficulties by him. His last contribution in "International 

 Clinics," vol. i. ser. 11, 12, is encouraging in the highest degree both for its 

 matter and for the illustrations. 



Fig. 170. Zeiss' Vertical Photo-micro- 

 graphic Camera. A. Set screw lidding 

 the rod (S) in any desired position. P. O. 

 Set screws by which the bellows are held in 

 place. B . Stand with tripod base in which 

 the supporting rod (S) is held. This rod is 

 now graduated in centimeters and is a 

 ready means of determining the length of 

 the camera. 3d. Mirror of the microscope. 

 L. The sleeve serving to make a light- 

 tight connection between the camera and 

 microscope. 0. The lower end of the 

 camera. R. '1 he upper end of the camera 

 where the focusing screen and plate holder 

 are situated. (From Zeiss' Photo-micro- 

 graphic Catalog. ) 



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 photography and photo-micrography at the same time, but that one 

 should learn the processes of photography by making portraits, landscapes, 

 copying drawings, etc., and then when the principles are learned one can take 

 up the more difficult subject of photo-micrography with some hope of success. 



The advice of Sternberg is so pertinent and judicious that it is reproduced : 



