MICROSCOPICAL DIAGNOSIS. 67 



nuclei, the size and number of nuclei in each cell, all should be 

 carefully noted. Then the tumor should be cut in small pieces, not 

 over one-half an inch square, and placed at once in dilute alcohol, 

 to be replaced in a few days by common methylic alcohol, and if the 

 tissue still remains too soft for cutting thin sections, stronger alco- 

 hol may be added for a day or two. Muller's fluid may be em- 

 ployed, but at this laboratory the best results have been obtained 

 by the use of alcohol alone. In two weeks the tissue will be of suf- 

 ficient consistence to allow thin sections to- be made with the aid of 

 a razor. By holding the piece of tissue firmly between the thumb 

 and fingers of the left hand, the razor held in the right hand can be 

 drawn from heel to point over the tissue, cutting the section suffi- 

 ciently thin for examination. Or by using one of the embedding 

 mixtures already given the piece may be embedded in the micro- 

 tome and sections cut as has been described. The arrangement of 

 the fibres and cells should be noticed, together with any alveolar 

 stroma that may be present. 



Carmine and haematoxylin are useful staining reagents. 



The sections are best preserved, after staining, by clearing 

 them in the oil of cloves and mounting in balsam or damar. 



It is very difficult to make a satisfactory classification of the 

 new formations. The classification given in T. Henry Green's 

 "Pathology and Morbid Anatomy" is as free from objections as any 

 with which we are acquainted. It is here given with slight changes: 



CLASSIFICATION* OF TUMORS. 



I. Type of the fully developed connective tissues. 



Type of fibrous tissue, - Fibroma. 



Type of adipose tissue, Lipoma. 



Type of cartilage tissue, Knchondroma. 



Type of bone tissue, Osteoma. 



Type of mucous tissue, Myxoma. 



Type of lymphatics, Lymphoma. 



II. Type of higher tissues. 



Type of muscle, Myoma. 



Type of nerve, Neuroma. 



Type of blood-vessels, - Angioma. 



Type of papillae, Papilloma. 



Type of secreting glands, Adenoma. 



