114 LABORATORY MANUAL 



a. starch paste, 



b. olive oil, 



c. raw egg-white. 



After 48 hours note any change in the level of the 

 liquids in the thistle tubes. At the same time test the 

 water in which the bulbs of the thistle tubes were 

 suspended : 



a. for starch, 



b. for oil, 



c. for protein. 



Has diffusion taken place in any of the foregoing? 

 In Exercise 5 did molasses diffuse through the animal 

 membrane? Why is it necessary to have foods 

 digested? 



CHAPTER XTX 



CIRCULATORY SYSTEM 



Exercise 77. Study of Beef ''Pluck." (Demon- 

 stration.) 



Object: A study of the relation of the heart and 

 lungs and their structure. 



Apparatus 



Beef "pluck," to consist of the Plaster model 



trachea, lungs, heart, and its Scissors 



covering, and the main blood- Scalpel 



vessels leading to and from Large glass tube 

 the heart 



Directions: A. In what part of the body are these 



