THE CELL DOCTRINE. 49 



in connection with Wolff, of whose theory he has 

 been the able exponent. In the same paper* he 

 has given us his own views " conceived in the spirit, 

 and not (infrequently borrowing the phraseology, ot 

 Wolff and Yon Baer." We present them, as far as 

 may be consistent with brevity, in his own words: 



"Vitality, the faculty, that is, of exhibiting defi- 

 nite cycles of change in form and composition, is a 

 property inherent in certain kinds of matter. There 

 is a condition of all kinds of living matter in which 

 it is an amorphous germ that is, in which its exter- 

 nal form depends merely on ordinary physical laws, 

 and in which it possesses no internal structure. 

 Now, according to the nature of certain previous 

 conditions, the character of the changes undergone, 

 or the different states exhibited or, in other words, 

 the successive differentiations of the amorphous mass 

 will be different. 



" The morphological differentiation may be of two 

 kinds. In the lowest animals and plants, the so- 

 called unicellular organisms it may be said to be 

 external, the changes of form being essentially con- 

 fined to the outward shape of the germ, and being 

 unaccompanied by the development of any internal 

 structure. 



"But in all other animals and plants, an internal 

 morphological differentiation precedes or accompa- 

 nies the external, and the homogeneous germ becomes 

 separated into a certain central portion, which we 

 have called the endoplast, and a peripheral portion, 



* Huxley, Review of the Cell Theory. Br. and For. Med.-Chir. 

 Rev., Oct., 1853, p. 305. 



