336 



EECEEATIVE SCIENCE. 



of it as he would the art of drawing, when- 

 ever he may have occasion. The writer, for 

 his own pleasure, and that of his friends, has 

 made use of photography in many ways be- 

 sides the ordinary uses of landscape and 

 portraiture. Amongst them may be men- 

 tioned copying insects, ferns, mosses, fossils, 

 shells, ancient deeds, seals, models of portions 



profess to be simple, are written by persons 

 who know little of the subject, or whose object 

 is to recommend some particular maker of 

 apparatus and chemicals. 



Among the many processes two are most 

 generally useful, viz., " wet collodion," suitable 

 for home-work, and " coUodio-albumen," for 

 use in the fields, or when from home. The 



THE OPERATING EOOM. 



of the moon's surface, letters, manuscript 

 music, rare engravings, paintings, scientific 

 instruments, machinery, etc. 



Books on photography generally treat of 

 all the known processes, and the reader is 

 bewildered, not knowing which of the number 

 to choose, and too often the manuals, which 



former requires the chemicals and apparatus 

 at hand ; in the latter, the camera and sen- 

 sitive plates are alone required for taking the 

 pictures, the preparation, etc., being per- 

 formed at homo. The printing process, which 

 is used for both, and which is very simple, 

 will be explained afterwards. 



