144 



CENTEAL SCIENTIFIC CO., CHICAGO, TJ. 8. A. 



No. 2804. 



2800. CHAMOIS SKIN, for cleaning instruments, etc. 



No 



Size, inches 



Each . 



A 



6x8 



$0.15 



B 



9x11 

 .30 



C 



10x13 

 .45 



D 



14x18 

 1.10 



1478. CHARCOAL STICKS, natural willow wood, 4xlx% inches Per dozen .50 



2804. CHART, Atomic Weight. Compiled by Dr. F. W. Clarke and reported to the American Chemical 

 Society. Corected up to 1918. Size 42x62 inches. Mounted on linen back on common 

 rollers 2.50 



No. 2806. 



2800. CHART, Mendelejeff Periodic System. The periodic arrangement of the elements according to 

 Mendelejeff, on the basis of O=16, Eevised and corrected up to 1918 by Dr. F. W. Clarke. 

 American nomenclature. Size 42x62 inches. Mounted on linen back on common rollers. 2.50 

 CHARTS, for Botany, Zoology and Physiography, C3nd for special bulletin. 



