LIST OF MICEOSCOPICAL 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 

 alttred, 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 adipose 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 later period 

 grow very quickly, and become the germ of one of 

 these, often hnge, 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 tissae. 



MICEOSCOPICAL SPECIMENS ILLUSTRATING LECTURE VII. 



No. of diameters 

 No. magnified. 



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



tilage 215 



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



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



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



cat ; showing different proportions of bioplasm 



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



50. Articular cartilage and subjacent bone, human 



finger 130 



51. Fibro-< artilage, interyertebral discs ; kitten, one 



day old ' .. 215 



