SOAPS, PROTEIN DERIVATIVES AND TISSUES 



221 



gelatin is converted into a basic gelatinate or a gelatin chlorid. 

 These compounds, at the same concentration, are more soluble 

 in water than the neutral gelatin and hence the liquefaction of 

 these systems. 



TABLE LXXI 



SODIUM GELATINATE AND SALT 



At the end of twenty-four hours the pure gelatin was solid; the gelatin plus the alkali 

 was liquid. The tubes containing sodium chlorid in addition were all solid, the optimum 

 stiffening effect of the salt being evident in tube 7. 



TABLE LXXII 



GELATIN CHLORID AND SALT 



Tube 



Concentration of mixture. 



i r hours aftrr tin- n.ixiuini had been prepared the pur* gelatin in tube 1 

 was solid; the acidified gelatin in tube 2 was liquid. A distinct influence >f the sodium 

 chJorid was r\ M tube 3 where the mixture barely flowed. The vinmmt v increased 



progressively from tube 4 to tube 7 in which tin optimum effect of the sodium rM..rid * 

 observed. Hera the gelatin was soli. I. t>ut n..r . r m,. so solid as the purr gelatin The 

 tHatin mixture* in tube* 8. 0. 10, 11 and 12 were solid, but, on being tapped, quivered 

 mora eaily than did the gelatin in tube 7. 



