10 INTRODUCTORY. 



the reports in the Zeit. wiss. Mik. and Journ. Roy. Micr. Soc., and 

 the price lists of the instrument makers. 



11. Staining Reagents and Chemicals. For some years it has 

 been difficult to obtain good dyes, but recently several new firms 

 have succeeded in manufacturing materials suitable for the most 

 critical work. The pre-war continental dyes were generally impure 

 products, and since the new dyes being made are mostly purer, it is 

 often necessary to make some slight alteration in the quantity of 

 dye added to "a staining mixture before the optimum staining 

 condition is reached. Details of such alteration necessary for 

 British dyes should be sent to the Journal of the Royal Microscopical 

 Society. I advise the reader to get his reagents and dyes from 

 some well-known British firm which has specialised in the matter. 



Great Britain. Flatters and Garnett, Ltd., 309, Oxford Road, 

 Manchester (all sorts of chemicals, dyes and apparatus ; makers of 

 Gilson's " Euparal ") ; the British Drug Houses, Ltd., Graham 

 Street, City Road, London, N. 1 (makers of many sorts of dyes) ; 

 The British Dyestuffs Corporation, Ltd., 70, Spring Gardens, 

 Manchester (important makers of dyes ; London agents are, Baird 

 and Tatlock, 14, Cross Street, Hatton Garden, E.G. 1) ; Hawksley 

 & Sons, 83, Wigmore Street, Cavendish Square, W. 1 ; and Charles 

 Baker, 244, High Holborn, W.C. (both firms are agents for Griibler, 

 and for most microscope and accessory apparatus makers). For 

 incubators, etc., for embedding and tissue-culture work, Charles 

 Hearson & Co., Ltd., 235, Regent Street, W. 1. 



United States of America. Eimer and Amend, 205 211, Third 

 Avenue, New York ; Palo Company, 90, Maiden Lane, New York ; 

 Edward Pennock, 3609, Woodland Avenue, Philadelphia, Pa. ; 

 General Biological Supply House, 5508, Kimback Avenue, Chicago, 

 111. ; The Will Corporation, Rochester, N.Y. ; Paul Weiss, 1620, 

 Arapahoe Street, Denver, Colorado. 



Germany. G. Griibler and Hollborn, Chemiker, Leipzig, Germany. 



