ubber Laboratory 



necessary apparatus for all kinds of 

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ERICK J. MAYWALD, F.C.S. 



CONSULTING CHEMIST 

 II. 'Phone, 823 John New York 



NOT A 



.P 



BUYERS' DIRECTORY 70 



RAIN COAT 



mruss THIS ctibctjlar 



aEGISTEaED 



Edited by HENRY C. PEARSON— Offices, No. 15 West 38th Street, NEW YORK. 



Vol. XLVII. No. 6. 



MARCH 1, 1913. 



35 CENTS. 



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