ELEMENTARY PHOTO-MICROGRAPHY. 19 



The point of focus, nay, even the illumination, 

 may make all the difference ; and without tan- 

 gible evidence in support of one's contention, a 

 verbal dispute may continue indefinitely. Here 

 a picture of the matter in question at once puts 

 the disputants on common ground, tells 'if they 

 are taking the same standpoint, and enables them 

 to join issue in a rational way or agree on the 

 cause of divergent opinions. 



Then the saving of time to one needing illus- 

 trations is immense. Fancy the labour under- 

 taken by some conchologists in sketching the 

 thousands of teeth in the " tongue " of a snail ! 

 Half an hour with microscope and camera will 

 secure better results than a month's labour with- 

 out the aid of camera. 



For educational purposes microscopic photo- 

 graphy promises great future development, especi- 

 ally in recording the movements and growth of 

 disease germs, as shown by aid of the cine 

 matograph. 



It is a great mistake to suppose that the value 

 or interest of living objects is in proportion to 

 the number of feet and inches they occupy in 

 space. The mystery that surrounds these 

 apparently insignificant forms becomes a source 

 of pleasure equal to any depicted in pages ot 

 romance, and the origin of life, its reproduction 



