APPENDIX. 



263 



FIG. 191. Simple Hand 

 Section Cutter. 



list price of the one shown in Fig. 191 is 16.00. Such an 

 instrument affords means of cutting sections in abundance 

 Avhen great delicacy is not of impor- 

 tance. To do more delicate work a 

 more perfect instrument is required. 

 If the laboratory is provided with one 

 of the larger microtomes, some form 

 of freezing attachment will reduce 

 very much the labor of making sec- 

 tions in large quantities. Of these, 

 that for the use of carbonic acid gas 

 is most to be desired. If this cannot 

 be afforded, Osterhout's attachment 

 for the use of ice water should be 

 obtained. It is listed at $2.50. The 

 writer has found it a thoroughly 

 practical and satisfactory accessory. 



Of other apparatus, there should be a supply of glass 

 slips and cover glasses, dissecting needles, scalpels or 

 razors, watch glasses, Petri dishes of different sizes, flasks, 

 and beakers, all of which are comparatively inexpensive. 



The teacher should gradually accumulate microscope 

 slides, and photomicrographs, to illustrate the more diffi- 

 cult points. These are especially to be commended in 

 the case of observations that would consume the time of 

 the class unwarrantably. Valuable additional instruction 

 may also be given in lectures and informal talks, espe- 

 cially if apparatus for projecting microscopic sections and 

 lantern slides is available. The L. E. Knott Apparatus 

 Company, Boston, have undertaken, at the writer's re- 

 quest, to furnish a set of lantern slides to illustrate this 

 course. They also furnish, at popular prices, new forms 

 of projection apparatus, using as the source of light arc 

 or incandescent electric lamps, acetylene gas, Welsbach 

 burners, or kerosene lamps. The slides will include about 



