332 APPENDIX. 



■water; to see that liquids actually pass up into the stem to 

 supply the loss by evaporation, place the stem in a colored 

 solutiou, as the juice of Poke-berries. Grow plants in the 

 dark, change them from light to darkness, and vice versa, 

 to verify statements in the text. Grow some plants by 

 " water-culture" as follows : 



Take of Potassic phosphate 12 milligrams. 



" Sodio phosphate 12 milligrams. 



" Calcic chloride 27 milligrams. 



" Potassic chloride 40 milligrams. 



" Magnesic chloride 20 milligrams. 



" Ammonia nitrate 10 milligrams. 



" Ferrous chloride a few drops. 



Dissolve the above in nearly a quart (one litre) of water. 

 Sprout the seeds and support them in the wide-mouthed 

 bottle containing the solution, so that the roots only will 

 dip in the solution ; provide a fresh. solution every week or 

 two, and thus grow the plant to maturity. Vary the 

 experiment by omitting one or more of the elements of 

 food or substances in the above list, and note the result. 



336. While pursuing the Systematic Botany, it is 

 desirable as far as possible to collect representatives of 

 the several groups from the native flora. Specimens 

 should not only be collected but preserved for subsequent 

 use and reference (directions for collecting, pressing, 

 poisoning, and mounting specimens of " flowering plants" 

 will be found in a companion volume to this book). The 

 same remark may apply to some extent in reference to 

 the study of Economic Botany. The objects and speci- 

 mens when studied in the text should, by all means, be at 

 hand for actual examination. A small sample of nearly 

 all that is not native or produced at home can be obtained 

 at the shops at a trifling cost. 



