423 



The same thing has also still proved possible when the nnmber 

 of large particles has about the limiting value. At 12° gclatification 

 begins to set in, for the Va 7o solution after 5 days. After the dilution 

 to ^J^ \\ the state of mixing was imperfect for a time, which follows 

 from the irregular values of the viscosity determination. The following 

 days these irregularities appeared to vanish, and a marked diminution 

 of the viscosity could be demonstrated. To facilitate a comparison 

 in the subjoined table also the variations have been given which 

 the ^1^ "/, solution exhibits after a previous heating at 12°. 



TABLE II. 

 Variation of the viscosity with the time at 12° in a 14% 

 solution, prepared by dilution of a gelatinized "2° solution. 



time 



viscosity 



+ 12.8 



after 20 hours] ±12.6 



„ 36 . 10.8 



r. 60 „ 



9.95 



Variation of the viscosity with the time at 12° in the 

 same solution after heating at 70°. 



It is evident that in these two cases the state of equilibrium is not 

 reached until all the gelatin is uniformly distributed throughout the 

 water and the ratio between large and small particles corresponding to 

 thi.- degree of solution has been establkhed. 



When water is added to a gelatin solution with so many large 

 particles that it is in the _</f /-condition, the changes are more intricate. 

 I will examine them at different temperatures. 



If a sheet of (practically) anhydrous gelatin is put in much water 

 of 30°, and this temperature retained, it quickly absorbs water, 



