348 APPENDIX. 



APPARATUS AND GLASSWARE. 



The necessary apparatus should be carefully planned and be 

 provided for in advance. The microscopes are the most expen- 

 sive pieces of apparatus, and yet in recent years very good mi- 

 croscopes may be obtained at reasonable rates, and they are 

 necessary in any well-regulated laboratory, even in elementary 

 work. 



Microscopes. If the students are provided with microscopes 

 the number will depend on the number of students in the class, 

 and also on the number of sections into which the class can be 

 conveniently divided. In a class of 60 beginning students I have 

 made two sections, about 30 in each section ; and 2 students work 

 with one microscope. In this way 1 5 microscopes answer for the 

 class of 60 students. It is possible, though not so desirable, to 

 work a larger number of students at one microscope. Some can 

 be studying the gross characters of the plant, setting up appa- 

 ratus, making notes and illustrations, etc. , while another is en- 

 gaged at the microscope with his observations. 



The writer does not wish to express a preference for any pat- 

 tern of microscope. It is desirable, however, to add a little to 

 the price of a microscope and obtain a convenient working 

 outfit. For example, a fairly good stand, two objectives (2/3 

 and 1/6), one or two oculars, a fine adjustment, and a coarse 

 adjustment by rack and pinion, and finally a revolver, or nose- 

 piece, for the two objectives, so that both can be kept on the 

 microscope in readiness for use without the trouble of removing 

 one and putting on another. Such a microscope, which I have 

 found to be excellent, is Bausch & Lomb's AAB (which they 

 recommend for high schools), costing about $25. 00 to $28. 00. 

 I have compared it with some foreign patterns, and the cost of 

 these is no less, duty free, for an equivalent outfit. Of course, 

 one can obtain a microscope for $18.00 to $20.00 without some 

 of these accessories, but I believe it is better to have fewer 

 microscopes with these accessories than more without them. 



