INTRODUCTORY. 11 



adapted foi* the production of continuous ribbons of sections 

 by the paraffin method, but not so well adapted for celloidin 

 or other work in the wet way, or for soft objects. Amongst 

 these are the Rocking MicrotomCj made by Tbe Scientific 

 Instrument Co., Cambridge, or by Swift & Son, or by Jung, 

 or by VAN dee Stad, Amsterdam ; the Minot, made by 

 Bausch & Lome, or by Becker (Gottingen), or by Zimmer- 

 mann (21, Emilienstrasse, Leipzig) ; the Reinhgld-Giltay, 

 made by J. W. Giltay, Delft. 



For descriptions of the multitudinous models on the 

 market see the i-eports in the Zeit. ini<s. Mik. and Joiirv. Roy. 

 Micr. Soc, and the price lists of the instrument makers. 



11. Staining Reagents and Chemicals, — You are not likely 

 to succeed in staining, especially in staining with coal-tar 

 colours, unless you see to it that you are working with 

 chemicals of the proper quality. You cannot ensui-e this by 

 going to a generally trustworthy house for chemical products 

 — at all events, not in the case of coal-tar colours. It is not 

 sufficient that these should be what they are commercially 

 described to be ; they may be pure, and yet not give good 

 stains. They must (in the case of coal-tar colours, at all 

 events) be the identical products used in their work by the 

 authors who have described and recommended them (see the 

 note on the numerous safranins in the market, s. v. Safra- 

 nin). I therefore advise the reader to get his reagents — at 

 all events his dyes — from the well-known chemists Gktjbler 

 & HoLLBGEN, who have specialised in the matter. 'Jliey may 

 be ordered from the price list, or by quoting the numbers of 

 the formulse in this work. The address is : G. Geijblee & 

 HoLLBGEN, Chemiker, Leipzig, Germany. Their preparations 

 can be obtained in London from Mr. Chaeles Bakee, 244, 

 High Holborn, W.C, or H. F. Angus & Co., 83, Wigmore 

 Street, Cavendish Square. (Both of these firms also supply 

 the microtomes and accessory apparatus of the best makers, 

 bacteriological apparatus, etc.) Griibler & Hollborn's pre- 

 parations can be obtained in the States from Eimee & 

 Amend, 205-211, Third Avenue, New York; Paul Weiss, 

 Optician, 1620, Arapahoe Street, Denver, Colorado ; and 

 Edward P. Dolbey & Co., 3613, Woodland Avenue, Phila- 

 delphia. 



