()S 



^o'nVf!, on ill llu' (lisi)C'i-so phase, i. c. tlicrc is a Icndcncy la 

 (Ic'crcasf [he rchilive siirlacc of llu- (lis|)rrsc |)hasc' which' 

 rrsuils ill a (iciialurali(»n. a Iraiisilioii lo a <^v\. 'I'lic (Iciialiira- 

 liou lal;cs plaec willioiit Ihc piTsciicc ol" Hviiiff cells and 

 the rale oi vrlocily of (knaluralioii depends upon several 

 factors sucli as Ihe coneeiilralion. liie eiiaraelei' of llie dis- 

 perse niechum. Ihe eleclrolyles and h'ni|)eraliii'e. 



In llu colloidal syslem. as we will consider Ihe hody 

 juices, Ihe surface forces |)lay an enormously ini|;orlanl role 

 hy chanjfing Ihe character. In \ilal pi-ocesses Ihe surface 

 forces are hy far tiie niosl iinporlanl. Our experimenls have 

 laughl us, that Ihe tissue cells succumh very ra|)i(lly if Ihey 

 Ihemselves are not allowed lo spread out in helween the 

 solid and licpiid |)liase. Il was noticed how importanl Ihe 

 framework was for Ihe life of tissue cells and how impor- 

 tanl the relationship was of the amount of licjuid to the 

 solids. (Fischer).*) On Ihe surfaces of solids, cell mem- 

 branes, colloidal particles, we have the theatre for the i)lay 

 of the physical forces, surface tension, potential differences, 

 membrant electricity and so on. i'henomena of oxidalion 

 usually occur at the free surfaces. The recent experiments 

 of P. du Xoiiy ^'-). seem to elucidate these i)roblcms. The 

 colloidal solutions seem lo exhibit remarkable properties 

 at the surface. Perhaps many of the phenomena can be 

 explained by Donnan's and L a n gm u i r ^i-') assumption 

 of the molecular orientation on the Tree surfaces, ^^"e know 

 after all, that spontaneous changes take place in colloidal 

 solutions. Changes of a similar kind might very well be 

 responsible for the spontaneous inaclivation of the growth 

 promoting substances of Ihe embryonic tissue juice. 



As already mentioned, the l)ody juices can be considered 

 as a polydispersoid system in a kind of stationary condition 

 in the body. This stationary condition is the result of tlie 

 life processes in the organism. If any attemj)t is made to dis- 



*) Unpublished experiments. 



