1,S 



tors wliich aro cncounttTcd. Physifo-chcinicnl processes arc 

 conlinuously goin<^ on in the hody-Jiiices as a result of the 

 various tissues. In Ihi' advanced techni(|ue of cultivating 

 animal tissue in \ilro. a First stej) is made lo submit 

 the dil'terenliated oi-<»anism lo a causal analytic investi<fa- 

 lion. Hy inlroducin<f tlie histological |)hysiolo,ify into 

 experinunlal medicine and i)iol()<,'y wc ha\c a new era. 

 The building-stones of the organism can now be investigated 

 under such experimental conditions, that many of the com- 

 pUcaled factors, wliich exist in the organism, can be clim- 

 ated or reduced in the culture. 



Among the numerous problems to be investigated by. 

 this line of research, it seems lo us very imjxjrlant to 

 know a liltlc more than we do already of the constilulionai 

 laws determining the regulation of growth of the various 

 tissues and organs. 



