PRACTICAL PHOTO-MICROGBAPHT. 21 



If it is true, and we assert that it is so, that the first neces- 

 sity is a knowledge of the use of the microscope on our special 

 object, it is no less true that he who begins photo-micrography 

 without considerable experience in photography will have a 

 hard task and many failures. The writer ventures to assert 

 that an enormous deal of trouble and perplexity will be spared 

 to the tyro photo-micrographer if he practise carefully before- 

 hand ordinary photography, specially of varied subjects, as 

 Landscape, Interior, Portrait, and most of all, Reproduction of 

 colored objects, as Paintings. The greatest stress will in this 

 book be put on color- correct, or " Ortho-Chromatic " photo- 

 graphy, because the writer is well assured that not only has 

 color-correct photography brought about vast improvements of 

 late in photo-micrography, but that color-correct photography 

 is destined to be the means of placing our science in the posi- 

 tion which it claims, and will sooner or later hold as the means 

 for the delineation of microscopic images. In a book of Pure 

 Photography, wherein the present author had the advantage 

 of collaboration with Professor W. K. Burton, C. E., the 

 writers have pointed out with considerable clearness the effect 

 of variations in Exposure and Development in ordinary photo- 

 graphy, and the Reader is strongly recommended to study this 

 book, and to gain as much proficiency as possible in pure photo- 

 graphy before starting on the special, but varied, operations 

 required to produce good micrographic negatives and prints.* 

 The present book will, however, treat photography on the 

 supposition of total ignorance on the Reader's part. The same 

 course cannot be followed regarding the microscopic branch of 

 the subject, for this matter is one of experience and long and 

 close observation rather than one which can, by however much 

 writing, be imparted from writer to reader. 



* The Processes of Pure Photography, by W. K. Burton. C.E,. and 

 Andrew Pringle, F.R.M.S. New York, The Scovill and Adams Co., 1888. 



