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



l'nuii the Pharmacological Laboratory, Cambridge, England.] 



A Dust-excluding Histological Iieagent Bottle. 



By 

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



Uritish Medical Association Research Scholar. 



W i t h o n e w oodc u t. 



Having experienced much inconvenience through contamination 



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



to prevent this annoyance. 1t has proved so 

 satisfactory that I give a brief description of it. 

 The bottle differs from the ordinary type 

 of reagent bottle in the structure of the neck. 

 In my form the neck ends abrnptly without 

 any lip. The pipette is also of the usual design 

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

 through which it passes , sufriciently large to 

 readily receive the neck of the bottle. The 

 cover must be at least 1 mm longer than the 

 neck to prevent fracture at the union of pi- 

 pette and cover. As a further precantion 



against 



such 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 construction. Messrs. 



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



the makers of this bottle. 



[Eingegangen am 18. September 1907.] 



