62 THE CELL DOCTRINE. 



tegrative molecules of one period become the histo- 

 genetic or formative molecules of another." 



Again : " As to development, the molecular is the 

 basis of all the tissues. The first step in the process 

 of organic formation is the production of an organic 

 fluid ; the second, the precipitation in it of organic 

 molecules, from which, according to the molecular 

 law of growth, all other textures are derived either 

 directly or indirectly."* 



Figs. 4, 5, 6, 7, illustrate these views amply. 



Fig. 4. Fig. 5. Fig. 6. Fig. 7. 



Fig. 4, Molecular structure of the scum on its first appearance, in a clear ani- 

 mal infusion. Fig. 5, Molecular structure of the same six hours afterwards. 

 The molecules are separated, and the long ones (so-called vibriones) in active 

 movement. Fig. 6, The same on the second day. Fig. 7, Filaments (so-callid 

 spirilla) formed by aggregation of the molecules, in the same scum on the third 

 and fourth days, all In rapid motion. 800 diam. linear. (From Bennett's Prac- 

 tice.) 



Prof. Bennett contends, also, that morbid growths 

 may easily be shown to originate in a molecular 

 blastema, though not to the exclusion of pre-existing 

 cells. The accompanying figures are sufficiently ex- 

 planatory. 



It should be stated also that this author, in com- 

 mon with others not accepting the cell doctrine in 

 its entirety, admits the production of cells by buds, 

 division or proliferation, without a new act of gen- 

 eration, and that " this fact comprehends most of the 

 admitted observations having reference to the cell 

 doctrine."t 



* Op. citat., p. 119. t Op. cilat., p. 123. 



