DIGESTION. 85 



2. Place the egg in dilute acetic acid or vinegar, 



and leave it a day or two until all the lime in 

 the shell has been dissolved. 



3. Wash and place it in a solution of dextrose. 



4. After a day or two measure the circumference 



in the same places as before and compare 

 these measurements with those first taken. 

 What does the difference show? 



5. Test the second egg for dextrose. 



6. Test the egg that has been in the dextrose solu- 



tion for dextrose. 



7. What has taken place in the first egg ? 



IV. IMBIBITION. 



A. Capillary Imbibition. 



Materials. Any colored solution, as red ink. Blotting-paper. 

 Apparatus. Glass tubing of different sizes. 



Experiment : 



1. Place a few pieces of glass tubing of different 



sizes in a glass of red ink and note the result. 



2. Suspend a strip of filter-paper or blotting-paper 



so that one end dips in the red ink. Leave 

 'for some time. What happens? Why? 



B. Molecular Imbibition. 



Materials. Glue. Water. 

 Apparatus. A small beaker. 



Experiment : 



l. Soak a piece of glue in cold water for about 

 half an hour. Compare this with a piece of 

 the dry glue and explain the difference. 



