APPENDIX B. 253 



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 wiU 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 wiU 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 wiU 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. 



