32 PLANT PHYSIOLOGY. 



time from year to year; besides, most of the appliances and 

 materials needed are of the simpler and least expensive sort 

 and may be used for many years. For the most part they may 

 be bought from the laboratory fees usually charged in colleges. 

 Even the cost of the full equipment does not surpass, if it 

 equals, the cost of equipment of a good anatomical laboratory. 



While only the actually necessary appliances are here to 

 be mentioned, the teacher will of course accumulate other 

 simple appliances and the commoner chemicals as he continues 

 to improve his experiments and to invent new ones. It is 

 desirable, too, as already pointed out, to add some of the more 

 exact and complicated appliances for demonstration purposes 

 and occasional exacter measurements, but these are not at all 

 necessary. 



Prices of most of the articles needed, when not here given, 

 may be found in the catalogues of any of the large dealers in 

 chemical supplies. The larger articles may be imported 

 through them duty-free for educational institutions. The ap- 

 paratus used in all of the exercises in Detmer's " Physiology ' 

 is supplied by Desaga, Heidelberg, while numerous very useful 

 pieces are sold by Professor J. C. Arthur, Purdue University, 

 Lafayette, Ind., from whom descriptive price-lists ma}' be 

 obtained. Most of Professor Arthur's apparatus is described 

 in the Botanical Gazette, 22, 463-472. All apparatus and 

 other supplies are furnished or imported by the Cambridge 

 Botanical Supply Company, Cambridge, Mass. 



A. APPARATUS USED IN COMMON BY ALL OF THE 



STUDENTS. 



A gas-table, 3 feet 6 inches high, with bunsen burners (about one to each 

 two students); also a fish-tail burner, a water-bath with support, extra 

 supports for beakers with wire netting, a small blowpipe, and a soldering 

 outfit. A foot-bellows with a blast bunsen burner is useful but not need- 

 ful. 



A tool-table with the ordinary tools; also fine and coarse wire 

 tweezers of the cutting kind; glass-cutter; 2 or 3 each of triangular, flat, 



