LIST OF MICROSCOPICAL SPECIMENS. 139 



times disturbed, and in consequence of a circum- 

 scribed redundant growth, a tumour of enormous 

 size may result. It is not uncommon to find this 

 unusual growth springing from the subcutaneous 

 adipose tissue of the limbs or trunk. In one par- 

 ticular spot the circumstances which determine the 

 regular and even growth of the tissue are somehow 

 altered, and growth having once burst its ordinary- 

 bounds, continues unceasingly, and often at an in- 

 creasing rate, until a tumour of large size results. 

 The structure of simple fatty tumours exactly accords 

 with that of normal adipose tissue, and the arrange- 

 ment of the capillary vessels is precisely the same. 

 It is possible that the formation of these tumours 

 may be due to the circumstance of a collection of 

 bioplasm which would, under ordinary conditions, 

 form a lobule of ordinary adif)Ose tissue, being dis- 

 placed at an early period of its development. Such. 

 a mass of developmental bioplasm being subjected to 

 the influence of new conditions, might at a laier period 

 grow very quickly, and become the germ of one of 

 these, often huge, morbid growths. Not only is the 

 constantly growing fatty tumour like adipose tissue 

 in its general characters, but in many instances the 

 minute structure of the morbid growth could not be 

 distinguished from that of the normal tissue. 



MiCBOSCopiCAi, Specimens iLLUSTEATiNa Lectuee VII. 



No. of (linmeters 

 No. iiiHgiiified. 



47. Cartilage, mouse's ear ; showing bioplasm and car- 



tilage . . . . . . . . . . • ■ 21o 



48. Cartilage, rib ; very young lamb : showing multi- 



plication of bioplasm near surface. . .. .. 215 



49. Cartilage, rib of kitten one clay old, and of adult 



cat ; showing diiferent proportions of bioplasm 



and formed material . . . . . . . . 215 



50. Aiticular cartilage and subjacent bone, human 



finger . . . . . . . . . . • • 130 



51. Fihro-i artUai^e, interTertebral discs ; kitten, one 



day old 215 



