A MANUAL OF BOTANY 5 



Drawings. Draw the seed, side and face views, and a 

 long section (m) to show the internal parts. 



4. Comparative Seed Study 



Other work. Make a table showing a number of different 

 seeds, using the following form : — 



Name of 

 Seed 



Dk.vwincs 



OK Seed 



Mono or 



Ok OTYLEDON 



External 

 Features : 



Color, 

 Hardness 



Win; he 

 Obtain KD 



Uses 



5. Seed ("umpositiox 



Tests. The instructor may either demonstrate or give 

 directions to the student so that he may discover for himself 

 the cruder composition of the bean, corn, and other seeds, 

 particularly showing: (1) The amount of water in ordi- 

 nary dry seeds, by carefully weighing a few ounces, drying 

 thoroughly over furnace or gas, and weighing again. Re- 

 cord your results in per cent. (2) The presence of starch, 

 by the iodine test. (3) The presence of sugar. The 

 Fehling or other test. (See root study, for 4, 5.) (4) The 

 presence of albumen (a i)roteid matter). The IVIillon test. 

 (5) The presence of oil. The ether test. 



Problems. Of what use, if any, are these various sub- 

 stances to the seed, or when will they be of use ? Of what 

 use to man are these substances ? Why are seeds normally 

 very dry? What explanation have you to offer for the 

 great variation in the size of seeds ? Name the largest and 

 smallest seeds you know. What important groups of 



