APPENDIX B. 2538 
fluid, since it does not alter the natural colors of most objects kept 
in it. 
Pure glycerine. 
Glycerine and distilled water, equal parts. 
Carbolic acid crystals. 
Carbolic acid, 2-per-cent solution. 
Iodine solution, prepared by dissolving 4 grams potassium iodide 
in 40 cubic centimeters distilled water, adding 1 gram iodine, and, 
when it is entirely dissolved, diluting the solution to 1000 cubic 
centimeters. ; 
Syrups of various strengths for pollen-tube production, made by 
dissolving ordinary granulated sugar in boiling-hot distilled water. 
' The water should be weighed cold, then heated in a flask and the 
weighed amount of sugar added. It will be found less troublesome 
to weigh out the required amounts in this way than to make a satu- 
rated solution and dilute it. Syrups of 2, 5, 10, 15, 25, and 30 per 
cent sugar will furnish range enough for experiment. If they are 
kept in glass-stoppered bottles which have been rinsed out with 
chromic acid solution and then with distilled water, the syrup will 
keep for months. 
Ammonium nitrate, 4-per-cent solution. This may be added in 
small quantities to potted plants as a fertilizer. 
Ether, commercial, for extraction of oil from seeds. (Benzine is 
cheaper and will answer nearly as well.) 
Sand, pine-sawdust, blotting-paper, for germination of seeds. 
Grafting-wax. 
Botanical apparatus and laboratory supplies of every description, 
including material for study, will be furnished by the Cambridge 
Botanical Supply Co., 1284 Massachusetts Ave., Cambridge, Mass. 
