12 ELEMENTARY PHOTO-MICROGRAPHY. 



sooner or later, failing which he is the more likely 

 to get tired and discouraged. 



The business man as well as the professional man 

 will find endless ways of turning the microscope to 

 profitable account, when once the art of illumination 

 and knowledge of correct exposure are overcome. 



The results of photo-micrography (pronounced 

 foto-mi-krog-ra-fi) are indisputable, and are far more 

 faithful than any sketches made by the most skilled 

 artist. The camiera-lucida, that did so well for our 

 fathers, is now a thing of the past, except where 

 simple outlines only are wanted, yet a few years 

 ago', even in our large cities, there were few persons 

 capable of producing good photo-micrographs, while 

 to-day they are produced in every branch of science. 



Only so recently as 1891 I had occasion to re- 

 quire some photo-micrographs of sand, but to 

 my surprise I was informed that in a city of 400,000 

 inhabitants only two or three persons outside the 

 Medical School were competent to do the work. 



There is no reason why the art should be confined 

 to the select few, for, after all, the mysteries are 

 not so great that they may not be lessened by a few 

 preliminary trials, one or two failures being suffi- 

 cient to indicate the direction in which an alteration 

 should be made. The apparatus need not be at aJl 

 costly in order to produce good results, although 

 for high-class scientific research everything must 

 necessarily be of the best. 



Consequently, for the purpose of this book a 

 special room with massive foundations in a special 



