280 Harvey: A Dust-excluding Histological Reagent Bottle. XXVI, 3. 



[From the Pharmacological Laboratory, Cambridge, England.] 



A Dust-excluding Histological Keagent Bottle. 



By 

 W. Henwood Harvey, M. B., (Tor.), 



British Medical Association Kesearch Scholar. 



With one woodcut. 



Having experienced much inconvenieiice tlirougli contamination 

 of histological reagents by particles of dust etc., I designed a bottle 



to prevent this amioyance. It has proved so 

 satisfactory that I give a brief description of it. 

 The bottle diifers from the ordinary type 

 of reagent bottle in the strnctnre of the neck. 

 In my form the neck ends abruptly without 

 nny lip. The pipette is also of the usual design 

 but, in addition, has a glass cover or dome, 

 through which it passes, sufticiently large to 

 readily receive the neck of the bottle. The 

 cover must be at least 1 mm longer than the 

 neck to prevent fractnre at the union of pi- 

 pette and cover. As a further precaution 

 against snch breakage a thin rubber or feit 

 washer may be placed upon the Shoulder of 

 the bottle to act as a päd on which the glass 

 cover rests. 

 The accompanying diagram shews this constrnction. Messrs. 

 F. P. Rittershaus & Co., 60, Huntley Street, London, W. C, are 

 the makers of this bottle. 



[Eingegangen am 18. September 1907.] 



