DIVISION I. 



THE STRUCTURE AND PROPERTIES OF PROTOPLASM. 



Section i. The Composition of Protoplasm, molar, me- 

 chanical, physical, and chemical. 



1. What is the molar composition (i.e., the form and size of 

 the masses) of the living Protoplasm of Plants? 



Your studies in previous courses have given you ample data 



for answering this question. Take time to think it over, recall 



and review your present knowledge, supplement it from books, 



lectures, or other available sources, and answer at your leisure. 



Leave page I in your laboratory book for tJiis. 



2. What is the mechanical composition (i.e., what structures 

 and diiferentiations has a single mass) of the living Protoplasm of 

 Plants ? 



Answer by concise descriptions, illustrated by logically 

 complete drawings, based upon a minute study of single proto- 

 plasts of (a] the stamen-hairs of Tradescantia virginica, and 

 (6) the tip-cells of Xitella. Supplement by additional data 

 from any available sources. 



Select young fresh-looking hairs or tips, and mount in 

 tap-water on a slide under a cover-glass. If tips are 

 dirty, clean with camel' s-hair brush. At present it is not 

 necessary to pay any attention to details of the movement. 



Living Protoplasm, excellent for observation, may be found also in 

 the leaf-cells of Elodea canadensis, in the hairs on the stems of tomato, 

 squash, and some other gourds, Cypripedium spectabile, and doubtless of 

 many other plants. It may be found also in some root-hairs, and in the 

 hyphae of some fungi. Practical directions for preparing these objects 

 for examination are given by Strasburger in Chapter 3 of his " Kleines 



