A MANUAL OF BOTANY 7 



equal weights of each preparation just named, mix in equal 

 amounts of water, and add one drop of 10 % iodine to each 

 ounce of the mixture. Study carefully the resultinf? colors 

 for similarity of tints. Read about starch making in the 

 United States. Collect all possible seeds that are used for 

 starch-making purposes. 



2. The Glucose Industry. 



3. The Oil Industry. 



4. TJie Proteid Products. 



5. The Drug Seeds. 



6. Perfumes and Spices. 



7. Beverages. 



8. Miscellaneous Manufactures. 



9. The Seed Industry for F((rms and Market Gardens and 

 House Gardens. 



Topics 2-9 are largely suggestive. The process of manu- 

 facture of glucose, albumen, and oils is generally beyond 

 the facilities of an ordinary laboratory. Seeds, however, 

 may be collected and classified according to use. Some 

 crude results of interest and value may, however, be obtained 

 by the student or instructor in : (a) Action of sulphuric acid 

 on starch of corn (a glucose step), (b) Oil by expression 

 or extraction by ether (see roots), (c) Production of tinc- 

 tures of seeds by digestion in alcohol. 



SECTION II. A STUDY OF SEEDLINGS 



Methods of growing. Seedlings of various kinds are to be 

 grown in various ways in quantity. Between folds of heavy 

 felt paper, kept moist, is an excellent method. Wet saw- 

 dust, sand, and many other ways may be tried. The student 

 ought to grow seedlings and keep a record of the methods 

 used or record those grown in the laboratory. 



Stages. Seedlings for the purpose of study may be con- 

 veniently considered in three stages: (a) First stage, the 



