PRINCIPLES OF OSMOSIS. 



4:7 



thistle -tube) was the more dense at the 

 beginning of the experiment? 



Has more liquid passed into the thistle-tube 

 or out from it ? How do you know ? 



When two liquids, therefore, of different 

 density are separated by an animal mem- 

 brane what change tends to take place? 

 Is the greater flow of liquid from the less 

 dense to the more dense or from the 

 more dense to the less dense? 



FIG. 4. 



6. Mark the level of the liquid in the thistle- 

 tube at the end of each successive twen- 

 ty-four hours. What inferences do you 

 draw? 

 B. Into a second this tie -tube carefully pour some 



starch-paste, cover with animal membrane, 



