232 Intelligence and Miscellaneous Articles. 



Spot, 4°f . Sun, 1%. 



Sun, 5°. Spot, 0°. 



The change in the temperature during the intervals of observation, 

 is due to the variations in the temperature of the room differently- 

 affecting the two extremities of the pile. 



In consequence of cloudy weather, another set of observations were 

 not obtained until the 10th of January, and at this time the spot had 

 very much changed its appearance ; the penumbra, while it retained 

 its dimensions in one direction, was much narrowed in the other, and 

 the dark part was separated into two small ones ; also the sky was 

 not perfectly clear, and therefore the results were not as satisfactory 

 as those of the previous observations ; the indications were, however, 

 the same as in the other sets, exhibiting a less degree of heat from 

 the spots. 



Cloudy weather prevented other observations on the heat of dif- 

 ferent parts of the sun, particularly a comparison between the tem- 

 perature of the centre and the circumference of the disc, which would 

 have an important bearing on the question of an atmosphere of the 

 sun. The observations will be continued, and any results of interest 

 which may be obtained will be communicated to the Society. 



METHOD OF PURIFYING OXIDE OF URANIUM FROM NICKEL, 

 COBALT AND ZINC. BY PROF. WOHLER. 



When the oxide of uranium, in its preparation from the pitchblende, 

 has been so far purified as to be dissolved in carbonate of ammonia, 

 sulphuret of ammonia is carefully and gradually mixed with the solu- 

 tion as long as a black precipitate falls. In this way nickel, cobalt 

 and zinc are entirely separated, without any uranium being thrown 

 down. — Liebig's Amialen, Oct. 1845. 



ON SOME NEW DOUBLE HALOID SALTS. BY M. POGGIALE. 



Protochloride of Antimony and Chloride of Ammonium. — The 

 protochloride of antimony combines with chloride of ammonium in 

 two proportions. When protochloride of antimony is added to a 

 solution of that salt, it dissolves readily, and only a slight turbidness, 

 arising from the formation of some oxychloride, is perceptible. On 

 evaporating the liquid at a gentle heat, at first beautiful rectangular 

 prisms are obtained, and subsequently hexahedrons or hexahedral 

 pyramids. The first are 3NH 3 HC1, SbCl 3 + 3HO, and the latter 

 2NH 3 HC1, SbCl 3 + 2HO. Both salts are colourless and transparent ; 

 they become yellow and opake in moist air, but are very permanent 

 in dry air, and are coloured yellow in the mother-ley when heated ; 

 they are likewise decomposed by a large quantity of water. 



Protochloride of Antimony and Chloride of Potassium. — This 

 salt is deliquescent, becomes yellow on exposure to the air, is de- 

 composed by water and also by heat ; it forms laminar crystals, the 

 composition of which is 3KC1, SbCl 3 . The mother-ley yields, on 

 spontaneous evaporation, hexahedral crystals of 2KC1, SbCl 3 . 



