CHAPTER XII 



MEDICAL WORK WITH THE MICROSCOPE 



TO the medical man, a microscope is all 

 important. In the first place it is abso- 

 lutely necessary for him to have an accurate 

 knowledge of the human body; he must be able 

 to recognise healthy blood, he must know the 

 varied cells composing muscle and bone, etc. Then 

 again the medical aspect of bacteriology is all im- 

 portant; we have devoted a separate chapter to 

 bacteria and there we warned our readers not to 

 look upon all bacteria as harmful, nevertheless, the 

 harmful ones are all important in medical work. 



Of recent years a knowledge of the structure and 

 habits of certain insects has become an important 

 branch of medicine for many of these creatures carry 

 diseases from one patient to another. This branch 

 of medicine is more important in the tropics than 

 in this country, for most of the really harmful 

 insects live in warm countries. 



A number of lowly animals claim attention from 

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