LABORATORY STUDIES AND DEMONSTRATIONS. 221 



A and D of Zeiss, or J and ^ incli of Bauscli and Lonib ; still 

 higher powers are desirable). 



A simple dissecting microscope; a desirable f(jrm is an ordi- 

 nary watchmaker's lens provided with a support. An (>r(lin;iry 

 pocket-lens; glass slides (3 X lin.), cover-glasses, watch-crystals, 

 small gummed labels, needles with adjustable handles, camel' s- 

 hair brushes, blotting and lilter paper, a good razor, pipettes 

 (medicine-droppers), glass rods and tubes, glass or pon-elain 

 dishes for staining, etc., a set of small dissecting instruments 

 (small scalpel, forceps, and straight-pointed scissors), a section- 

 lifter, pieces of pith for section-cutting, thread, a shallcnv tin pan 

 lined with wax, long insect pins for pinning out dissected s])eci- 

 mens, drawing materials, and a note-book for sketches and other 

 records. 



Each table should be furnished with a set of small reafjent- 

 bottles, a Bunsen burner, wash-bottle, test-tubes, beakers, and a 

 bell-glass for protection from dust. Thermometers, a balance, 

 microtome, drying oven, and a paraffin water-bath should also be 

 accessible. 



REAGENTS AND TECHNICAL METHODS.* 



Alcohol. — Since biological laboratories belonging to incorpo- 

 rated institutions obtain alcohol duty free, it should be UheniUy 

 supplied and freely used. Alcohol of 100°, i.e., "absolute" 

 alcohol, may be purchased in 1-pound bottles. "Squibb's" 

 absolute alcohol may be obtained of any druggist, f but ordinary 

 alcohol of 90-95^ answers nearly every purpose. ''Cologne 

 spirits," i.e., alcohol of about 94^, may be obtained from the 

 distillers at 60c., or thereabouts, per gallon. It may then be 



Bausch & Loinb Optical Co., Rochester, N. Y.; the Fnmkliu Educational 

 Co., Hamilton Place, Boston; or Queen & Co., Chestnut Street, Phihulelphia. 

 Chemical and other apparatus may be obtained from Eimer & Amend, 205-211 

 Third Avenue, N. Y. 



* Every laboratory should be supplied with some of the standard books upon 

 this subject, e.g., Strasburger's Botanisclie Practicinn, Jena; Whitniun'a 

 Methods of Research in Microscopical Anatomy and Embryology, Boston: Lee, 

 The Microtomist's Vade Mecum, last edition; Zimmerman's Botanical Micro- 

 technique (Humphrey), Holt, N. Y. 



f See also Whitman, 1. c, p. 14. 



