ABSORPTION OF LIQUID NUTRIMENT. 



13 



EXPERIMENT 14. 



OSMOTIC ACTION OF A SUGAR SOLUTION. 



Cover the large end of a thistle-tube or small glass funnel with 

 sightly-stretched membrane, such as parchment or bladder, which 

 has been soaked for 15 minutes in water. Fill the large part of the 

 tube or funnel with a solution of sugar i part and water 3 parts, and 

 fasten upright by means of a large perforated stopper in a cylinder 

 containing water, in such position that the two fluids are on a level. 

 Note the height of the solution in the tube in 12 and 24 hours. A 

 large amount of water has been drawn through the membrane into 

 the sugar solution, while only a small portion of the latter has passed 



out into the cylinder, as can be ascertained by 



tasting. (Fig. 7.) 



EXPERIMENT 15. 



OSMOTIC ACTION OF A SOLUTION OF COPPER SULPHATE. 



Cover one end of 

 an ordinary lamp-chim- 

 ney tightly with hog's 

 bladder or parchment, 

 fill with a solution of 

 copper sulphate, and 

 suspend in a vessel of 



Fig. 9. 



1^1 



Fig. 7. 



Fig. 8. 



Osmometer. (Miil- 

 ler.) b, bulb of 

 thistle -tube ; D, 

 level of liquid in 

 cylinder; r, level of 

 liquid in tube after 

 a few hours' opera- 

 tion. 



Osmometer. (Oels.) 

 K, cork to hold 

 lamp-chimney in 

 place ; c, open end 

 of lamp-chimney. 



Carrot hollowed 

 out and filled 

 with sugar. 

 (MiiUer.) 



distilled water. After a time the bluish color 

 of the water in the vessel, and the copper-red 

 coating formed on an iron nail placed in the vessel, denote that the 

 copper-sulphate solution has passed through the membrane into the 

 distilled water. (Fig. 8.) 



