4 CLINICAL BACTERIOLOGY AND HEMATOLOGY 



about by the eye-piece is attended by a loss of definition. The 

 same applies to the increased magnification obtained by pulling 

 out the draw-tube. 



Fig. 3.— Portable Microscope (Swift) 



Fig. 4. — Portable Microscope (Swift 



The total cost of a microscope may be put down at _£i^, and 

 for this sum a thoroughly efficient instrument can be obtained, 

 while one' that will answer every purpose may be bought for 



