DIATOMS 



1 The human eye is the most perfect photographic 

 camera in the world. In looking at the diatom 

 through the microscope, its image is photographed on 

 the retina of the eye. Now if we remove the eye, 

 and in its stead we place a camera that has an extra 



Fig. 34. Triceratium. A Diatom enlarged several hundred diameters. 



long bellows attachment, we have only to fix the 

 lamp so that the centre of the blaze, the diatom in 

 position, the microscope, and the whole length of the 

 camera are in one perfectly straight line. This is 

 done by arranging them so that the microscope and 

 camera lie horizontally. With care and experience 



H 



