SCIENCE-ADVERTISEMENTS 



^ 



high 



Brade 





For filtering metastannic acid 

 and other fine precipitates 



that ordinai'ily are difficult to filter, try Whatman No. 

 42. For such purposes this grade is highly endorsed by 

 chemists as unequalled. 



Nos. 1 to 5 for Qualitative work : Single-washed grades 

 Nos. 30 and 31 for Quantitative work where a low ash is 

 not of primary importance. Double-washed grades Nos. 

 40 to 44 for the most exacting analyses. Refer to the 

 Typical Applications given in the Whatman booklet. 

 They will help you to select the grades most suitable for 

 your purposes. 



There's a grade to suit your preference. 



Order from your dealer 



H. REEVE ANGEL & CO., INC. 

 120 Liberty Street, New York 



Sole Representatives for U. S. and Canada 



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