THE GREEN PLANT. 



31 



the yeast-cell (Fig. 21) ; it has a woody or cellulose 

 sac, cell-jelly, or protoplasm, within the sac, sometimes 

 a thin space, vacuole, and sometimes a little round 



Fig. 22. 



Bkoken Cell. 



spot which looks like a kernel, or nucleus. If yon 

 press the cells lightly, the little sacs will burst, and the 

 jelly-like protoplasm will flow out (Fig. 22). You can 

 also color the cells with magenta, as you did the yeast 

 or torul^ ; but, if you color them with iodine instead 

 of magenta, you will notice that some of the jelly or 

 protoplasm gets blue. Now, iodine turns starch blue ; 

 so it may be there are some starch-grains in these cells, 

 but we do not know positively. These cells, too, like 

 the yeast-cells, have an odd name of their own — proto- 

 coccus. It means— -first berry. Perhaps this name was 

 given because these cells look like berries. I think you 

 can remember it, because you have learned other names, 

 which are just as long and hard, such as Yang-tse-Kiang 

 and Brahmapootra ; besides, you see protococcus al- 

 most every day, while probably none of you have ever 



