CHAPTER V 



NEGATIVE MAKING 



Photo-micrography is usually divided into 

 three groups, designated low, medium and 

 high power work. To these I have taken the 

 liberty of adding a fourth group under the 

 designation of photo-macrography, a slight en- 

 largement (less than ten diameters), of macro- 

 scopic objects. The amplification of the first, 

 or low power group, ranges from ten to one 

 hundred diameters; that of medium power, 

 between one and five hundred, and the term 

 high power, is applied to all enlargements 

 greater than the last amount. The group of 

 photo-macrographs comprises all subjects that 

 do not require to be magnified more than 

 ten diameters, which is readily reached by a 

 good photographic lens and a suitable camera, 

 without the employment of a microscope at 

 all. The wings of butterflies, many large 

 insects, leaves, small flowers and a host of 

 similar objects, needing but slight enlarge- 

 ments to make striking and instructive pic. 

 tures, may be named as indicating some of 



D (49) 



