TEAST 29 



brush, blotting-paper, absorbent cotton, U-shaped glass 

 tube, baking-soda (bicarbonate of soda"), and dilute 

 muriatic or dilute sulphuric acid. 



MOEPHOLOGY 



a. Arrangement. — How are the cells arranged? Do 

 you find any single cells ? Any groups ? How 

 many cells in a group ? Are the cells arranged 

 similarly in the various groups ? Is this arrange- 

 ment comparable to that of any Protozoa which 

 you have seen? "What holds the ceUs together? 

 How many cells in a complete yeast plant ? 

 Make drawings showing the various arrangements of 



the cells you find. 



h. STiofpe. — What is it ? Is it symmetrical ? Are all of 



the cells shaped alike? Is the shape constant 



or does it change? Compare with Amceba and 



Parameoium. 



Make drawings of single cells showing how they 



look in outline when seen from the side and from the 



end. 



c. Size. — Is a single yeast cell visible to the unaided 



eye ? "With the scale measure the actual size of 

 several cells. Do you find any variations in size ? 

 If so how do you account for them ? 



d. Color. — "What is the color of a single cell? How 



does this compare with that of fluid yeast ? 

 Explain. Do you detect any green coloring 

 matter or chlorophyll in the cells ? 



e. Structv/re. 



1. The cell-wall. — Crush some of the cells by 



