Intelligence and Miscellaneous Articles, 893 



tain sufficient quantities of arsenic to admit of the extraction of tho 

 \netal. 



The reddish-brown ochre of the ferruginous spring of Briickenaii 

 contains mere traces of arsenic, but there is much copper. Tin has 

 been discovered in the ochres of Kissingen and of Briickenau. Ex- 

 periments performed to ascertain the presence of arsenic and copper 

 in the brownish-yellow ochre of the ferruginous waters of Kellberg- 

 were not followed by any positive results. — Journ. de Ph. et de Ch., 

 Aout 1847. 



SOLUBILITY OF COMMON SALT IN ALCOHOL. 



M. Wagner has determined the degree of solubility of chloride of 



sodium in alcohol of different densities and at various temperatures. 



The results are that — 



o 

 Alcohol of 75 per cent, dissolves at 57*20 F, 0'661 part of salt. 



75 .... 59'45 0-700 .... 



75 100'40 0-736 



75 160-70 1-033 



95-5 .... 59-0 0-174 



96-5 171-05 0-171 - 



Ihid, 



ON SOME IMPROVED FORMS OF CHEMICAL APPARATUS. 

 BY THOMAS TAYLOR, ESQ. 



Among the many advantages possessed by the Chemical Society, 

 it appears to me not the least, that it affords to its members a ready 

 mode of communicating to one another many of those little practical 

 facts and modes of operating, which, although perhaps not of suffi- 

 cient importance to merit distinct notice in the scientific journals, 

 are nevertheless of considerable value to those engaged in the prose- 

 cution of the science. In furtherance of this view I will therefore 

 describe some new forms of apparatus which I have myself been in 

 the habit of using for some time past. 



The first of these is a mode of closing the mouths of gas-bottles, 

 or indeed of any wide-mouthed vessel into which tubes are to pass, 

 as in Woolf 's apparatus, gas generators, &c. To effect this the top 

 of the bottle is first to be slightly ground, so as to procure a level 

 surface, a piece of sheet caoutchouc is then laid upon it, and this is 

 covered by a disc of wood of the same size as the top of the bottle, 

 and from a quarter to half an inch in thickness. The wooden cover is 

 held in its place by means of a small double clamp of brass or of 

 varnished sheet iron, which passes across the cover, and the ends of 

 which are bent under the rim of the bottle, against which they are 

 pressed by a screw fixed in the centre of the clamp. By turning 

 the screw the caoutchouc is sufficiently compressed to render the 

 joint perfectly air-tight. The tubes intended to pass into and out 



