Wollastoiiite (tabular spar), 2 Ca 3 Si O^, 

 Kalk-trisilicat of Gjelleback, Ca Si 0^. 

 Gurolite, . , . 2 (Ca O Si O3) + 3 Ho. 



Dysclasite, . . . 3 Ca 4 Si O3 + 6 Ho. 



It thus appears that gurolite is the same silicate of lime as the 

 kalk-trisilicat, in union with water, and that its relation with 

 dysclasite is such that two equivalents of gurolite differ from one of 

 dysclasite by a single equivalent of lime only. 



2. On the Constitution of Bebeerine. By Dr A. Von Planta. 



The author commenced his paper by referring to the analyses of 

 Maclagan and Tilley, which gave for the composition of bebeerine a 

 formula precisely the same as that of morphia, but as that formula 

 appeared to require confirmation, he had undertaken the careful re- 

 investigation of bebeerine. 



In the commencement of his experiments he had employed the 

 same process for the purification of bebeerine as that recommended 

 by Dr Maclagan. He soon ascertained, however, that in this way 

 it was impossible to obtain it in a state of absolute purity, as even 

 when every care had been taken, it always retained a small quantity 

 of a substance resembling tannine, which caused it slowly to gain 

 weight in the process of drying the water bath. After several trials 

 he found the following process to yield pure bebeerine : — The sub- 

 stance already partially purified by Maclagan' s process was dissolved 

 in acetic acid, and mixed with a solution of acetate of lead and 

 caustic potash gradually added as long as a precipitate of bebeerine 

 mixed with oxide of lead was obtained. The precipitate was then 

 washed and dried and extracted with absolute ether, and the filtered 

 ethereal solution distilled. A syrupy residue was obtained, which 

 was dissolved in absolute alcohol, and mixed with a large quantity 

 of water. 



Bebeerine so prepared is a perfectly colourless and inodorous 

 powder persistent in the air and highly electrical. It fuses at 356^ 

 into a colourless glassy mass. The quantity employed for analysis 

 was from two different preparations, and gave the following 

 results : — 



