REVIEW ON CELL-CONTENTS 25] 



in October. To study crystals and cystoliths : section the 

 rootstock of skunk cabbage or Jack-in-the-pulpit, the leaf 

 of Ficus elastica, the leaf of ivy (Hedera helix); make a 



separate mount of each in water, and examine wit 1 1 the 

 high power. When the crystals are found, draw them, 

 with a view of the adjacenl cells. Make a similar study 

 of a bit of thin onion skin. 



4<)o. Summary of cell-contents and products: 



1. Chlorophyll. 



2. Cell-sap, and substances found in solution. 



3. Starch. 



4. Amylo- dextrine. 



5. Aleurone grains (crystaloids and globoids). 

 (i. True crystals, and other mineral matter. 



R vif.w. Name >i\ classes of tents or products of the cell. 



Where found! Of whal use? What is chlorophyll! What is its 

 use.' What is assimilation (170 I Give outline of the products of < 

 found dissolved in cell-sap. What are the uses of Bugar to plai 

 Name some kinds of sugar found in plants. Describe an experiment 

 to test for glucose. Same for cane sugar. How may we find the oil 

 in plants .' Describe an experiment for the Btudy of gum -resin. Why 

 does the juice containing it appear white? Describe Btarch grains of 



to. Tell how starch grains of other plants Btudied differ from 

 those of potato. What are the uses of Btarch to the 

 is the plant's starch factory? Describe an experiment to test 

 Btarch. Name Bome plants in which we may find amj ine. 



How does its test differ from thai for starch? What are aleui 

 grains? In what cells are they found in kernels of wheat? N 

 some of the forms in which we find true crystals in plant cells. 



Note to Paragraph 397. The digestion of Btarch is produced 

 by means of en tjms or unorganized ferments (i. i dch 



are aol bacterial or fungul, hut are chemical Bubutanci 

 ferments, as diastase, are presenl in - nd other It 



containing Btarch. During dormant periods the 

 not present, or their action is prohibited by the pr< 

 substances. There are various specific enzyra 

 definite chemical changes. 



i trape Bugar and its a- to be the forum 



most generally useful to plant-. Cant is read i ted into 



these sugars. 



