ON CELL GROWTH AND CHANGES. 91 



most modern German school to their masses of nuc- 

 leated protoplasm. The allocation to these definite 

 " centres," not only of the forces engaged in the nutri- 

 tion of the textures, but in the reproduction of new 

 forms both in normal and pathological processes — a 

 doctrine which has been in its special relations to 

 pathology so systematically pursued by Virchow and 

 his disciples — was unmistakably present in the mind 

 of Goodsir, and also articulately expressed in the patho- 

 logical papers in the series now referred to. This, it 

 must be remembered, was at a period when the origin 

 of new cell-forms by a process of precipitation, or mole- 

 cular aggregation in a fluid blastema or exudation, was 

 the doctrine prevalent in the schools. 



Of the part which the nucleated cell plays in the 

 processes of nutrition, secretion, and reproduction, 

 normal and otherwise, it may perhaps suffice to refer 

 the reader to the paper on " Centres of Nutrition/' to 

 that on "Absorption and Ulceration, and the Struc- 

 tures engaged in these Processes," and " On the Process 

 of Ulceration in Articular Cartilages ;" to the memoir 

 on " Secreting Structures," and the short essays on the 

 " Structure and Economy of Bone," and on the "Mode of 

 \l> production after the Death of the Shaft of a Long 

 I '< me." Corroborative evidence may also be met with in 

 his memoir " On Diseased Conditions of the Intestinal 

 Glands," and the paper on the "Structure and Patho 

 logy of the Kidney ;in<l Liver." In these various essays 

 the presence of the products of secretion within cells; 

 the increase which takes place in the si/'' of the cells. 



