MACDOUGAL-Vi^CTION OF LIPOIDS IN GROWTH. 45 



the action of potassium solutions. Two cells were used for each 

 case and the endosmosis for 20 hours was as below : 



Cell-contents. Immersion. Excretion or Endosmosis. 



Water Water i.i, 1.2 c.c. 



KCl 0.005M Water 4 3 c.c. 



KCl o.oosilf ] Saponin 0.2, 0.3 c.c. 



Saponin .oosM I 0.005M 



KCl 0.005M (cell treated with 



lecithin only) Saponin 0.0, 0.0 c.c. 



o.oosM 



KCl o.ooSiV/ (lecithin only) Water S-3, 3-5 c.c. 



One of the most noticeable features of the tests with the potas- 

 sium solution as above, as well as with the sodium and calcium the 

 results of which are given below, is to the acceleration of the action 

 of the cells so that the amount of endosmosis was greater during the 

 first 24 hours than with cells not treated with lecithin. This is espe- 

 cially noticeable in cells coated internally with lecithin only. 



The measurements of the action of cells filled with sodium solu- 

 tion are given below : 



Cell-contents. Immersion. Endosmose. 



Water Water 1.4, 1.3 c.c. 



NaCl 0.005M Water 1.6, 1.5 c.c. 



NaCl o.oofM ) c • -JIT 



, , \- Saponin 0.005M 0.0, 00 c.c. 



Saponin o.oosilf j 



NaCl 0.005M (lecithin only) Saponin 0.005M 0.0, 0.0 c.c. 



NaCl o.oo5ilf (lecithin only) Water 2.7, 5.6 c.c. 



A series of cells with calcium as the principal salt-content showed 

 action as follows : 



Cell-contents. Immersion. Endosmose. 



Water Water 2.4, 0.4 c.c. 



CaCl, .005M Water 0.9, 0.6 c.c. 



CaCl, .005M I Saponin 0.005M 2.6, 0.2 c.c. 



Saponin .005M ) 



CaCl, .005M (lecithin only) Saponin .005M 



Exosmosis o o 



CaCl, .oosM (lecithin only) Water 4.0, 0.5 c.c. 



The cells containing potassium were run for 20 hours, those with 

 sodium 16 hours, and those with calcium 24 hours. The endosmosis 

 for two cells in terms of excretion of water is given in each case. 



