ELISHA MITCHELL SCIENTIFIC SOCIETY. 85 



zinc is contained in the ores used by this Company, the said ores 

 being ordinary brown hematite. Nor has zinc been found in the 

 coke and Umestone used — evidently occurring then in minute traces, 

 probably in the ore. The deposit was very large, nearl ; choking 

 the mouth of the furnace. The specimen had a laminated appear- 

 ance, as if deposited in layers, and was greenish-brown in color. It 

 was quite hard, breaking in thin plates, like shale, m the direction 

 of the lamination and the specific gravity was 5. 0405 (temp, of water 

 16°C.). 



The analysis gave : 



ZnO - . - 93. 34 



PbO 2.37 



Fe (metallic) 1.09 



CaCOg 1. 01 



C --- -- .20 



SiOg --- - i-ii 



100.02 

 Chemical Laboratory, U. N. C. Thos. Radcliffe. 



CAFFEIN IN YEOPON LEAVES. 



Having in my possession a small sample of the leaves of the 

 Yeopon (gathered in January), a qualitative examination for CaHein 

 was made. The leaves were boiled with water for one to two hours 

 (condensing the water in an upright cooler). This infuv^ion was 

 neutralized with magnesia then shaken with chloroform and the 

 two layers of liquid separated. The chloroform was then evaporated 

 off and the residue purified by dissolving in alcohol, then in water, 

 and lastly in alcohol once more. The residue thus purified was .31 

 per cent, of the whole dried at 100='C.,.but the original sample was 

 so small that no great reliance could be placed on these figures. 



The residue was carefully compared with caffein from Powers & 

 Weightman, and presented a close rese oblanceto it in every respect. 

 It was sparingly sohrble in water, more so in alcohol and quite so in 

 chlorolorm. It gave a very distinct murexid reaction. 



When a larger sample of the leaves can be obtained at a more 

 favorable time of the year, a thorough quantitative examination 

 will be made. 



Chemical Laboratory, U. N. C. F. P. Venable. 



