4IO APPENDIX. 



weight) 4 parts, beeswax 2 parts, tallow i part; mix well; pour 

 into a pail of cold water; grease the hands and " pull " till nearly 

 white. In using it should be handled with greased fingers to 

 prevent its sticking to them. 



Iodine. — Either solid, from which the tincture can be prepared 

 by dissolving a few flakes in alcohol, or the tincture may be pur- 

 chased. 



Mercury. — For directions for keeping it clean and dry, see 

 Botanical Gazette 22 : 471. Dec. 1896. 



Paraffin. — A common quality, melting at about 65 C. 



Phenolphtalein. — A few grams will last a long time. 



Potassic hydrate. — May be bought in sticks and the solution 

 made, but it is more convenient to buy the liquor potasses of 

 druggists. 



Sodium chloride. — Table salt is pure enough. 



Vaseline. 



APPARATUS FOR MORPHOLOGY. 



Dissecting microscopes. — Each pupil should be provided with one. 

 A most effective low-priced dissecting microscope was designed 

 by the author and is manufactured by several firms. In no case 

 has the author any financial interest in the instruments. The 

 stand T I, manufactured by the Bausch & Lomb Optical Co., 

 Rochester, N. Y., with i-inch lens, and a similar one by Queen 

 & Co., Philadelphia, have been approved by the designer. Many 

 forms offered to schools by jobbers are not worth buying. 



Compound microscopes. — The school should be supplied with at 

 least one good compound microscope for demonstrations, and as 

 many more as can be profitably used. If the teacher is capable 

 of using such instruments properly he will be able to select it 

 wisely with such advice as he may obtain from personal acquaint- 

 ances on whose judgment he can rely. Schools are advised to 

 deal only with manufacturers of established reputation. 



Scalpels. — Each pupil should be provided with a sharp knife 

 with slender blade for dissection. It is desirable for the school 

 to furnish scalpels of suitable form. The slender blades, 3-3.5 

 cm. long on cutting edge, are recommended. 



Forceps. — Straight form, with smooth points, will be found use- 

 ful, though not indispensable. 



Needles. — Each pupil should have a pair of needles (No. 6, 



