TUMOES. 



381 



a general tubular structure, the acini being in an undeveloped 

 state. 



Figs. 347 and 348 show sections of the mammary gland of a 



Section from the mammary gland of a nullipara, aged twenty-two ; more highly magnified. 



(Altmann.) 



woman, aged thirty-eight, who had born five children. The sec- 

 tions were taken at the beginning of functional activity of the gland. 

 Figs. 349 and 350 represent involuted mammary glands, respec- 



Section of the mammary gland at the beginning of lactation; moderately magnified. 



(Altmann.) 



tively nine and fourteen months after functional activity had been 

 arrested. 



Adenomata are usually of benign character ; but, as is the case 

 with all neoplasms, it will not do to conclude that a growth is harm- 

 less merely because it can be included in a group of tumors that are 

 usually benign. The evidence as to its tendencies revealed by the 



