APPENDIX B. 251 



microscopic preparations described on pages 256, 257. The subjects 

 chosen are slides 1, 2, 3, 4, 5, 7, 8, 9, 11, 13, 14, 16, 17, 20, 21, 22. 

 A price-list of these photo-micrographs, together with many hundreds 

 of others on botanical subjects, -will soon be issued by Mr. Walmsley, 

 -who wUl meantime furnish the set above mentioned to teachers who 

 wish them. Among the other botanical photomicrogTaphs which 

 Mr. Walmsley has in stock are those of starches, pollen, sections of 

 woods and stems, ovaries (sections), spiral and annular vessels, leaf- 

 sections, stomata, leaf-scales and hairs, mosses (entire), algiB (marine 

 and fresh-water), fungi. 



Miss E. M. Drury, 119 St. Botolph Street, Boston, will also furnish 

 photomicrographs of the set of 24 above mentioned (from Mr. 

 Walmsley 's negatives). Her prices will be : for unmounted blue- 

 prints, $0.85 per dozen ; for mounted silver-prints, $2.00 per dozen. 



A small balance. 



The hand-scale with 5-inch beam and set of weights from .01 

 gram to 20 grams, furnished by Eimer & Amend of 205-211 Third 

 Avenue, New York, for about $2, is good enough. 



A trip-scale. 



The " Harvard trip-scale," furnished by the Fairbanks Scale Co., 

 for about $5.70, is well adapted for weighing potted plants for tran- 

 spiration experiments, etc. 



A cylindrical graduate of 250 to 500 cubic centimeters capacity. 



One or two large bell glasses. 



Inexpensive one and two quart battery jars for use in cultivating 

 potted plants, — for transpiration experiments. (Earthen flower-pots 

 are not so good, because they permit too much evaporation through 

 their sides.) 



Six or eight-quart dishes for germination experiments. 



Wide-mouthed bottles. 



Glass cylinders of about 300 cubic centimeters capacity for water 

 cultures. 



A section-knife, or a razor, flat-ground on one side, hollow-ground 



on the other. 



An Arkansas oilstone. 

 Watch-glasses. 

 Glass-stoppered reagent bottles. 



