﻿MORRIS-AlREY, On tlie Rigidity of Gelatine. 



Within the limits of experimental error m x / is a constant. 

 Cylinders of equal length but different diameters were 

 then filled with jelly of the same composition and arranged 

 so that either could be connected by a system of taps with 

 the capillary tube and the vessel LM. 



According to the formula, 



R 4 / 



should be constant, 



and this was verified to within I per cent. 



Using pure gelatine solution containing 5 per cent, by 

 weight of leaf gelatine, the coefficient of rigidity was 

 determined at intervals beginning two hours after the jelly 

 had been placed in the tube. Fig. 4 shows the alteration 



5'iu' 





*x/0 4 



r 





I Soluvon oe GeuTiNt 



>* i"0* 



\ in Wateq 1 20 



^ S '10' 



\ 



I'lO' 







Fig. 4. 

 of r/ with the time. After attaining a steady state, which 

 occurred about eight days after the solution had been 

 poured into the experimental tube, the value of the 

 coefficient of rigidity was found to be 4-64x10' C.G.S. 

 units, the lowest rigidity actually measured being i'6S x io 4 . 

 The most interesting portion of the curve is the 

 ascending branch, with the shoulder joining it to the 

 already familiar horizontal portion. I believe the appar- 

 atus described above is the only one yet devised which is 



