4XM Scientific Intelligence. 



now added to the clear solution^ it should still occasion slight precipitation, 

 for 60 of sulphate of quina contain 5.8 gr. of sulphuric acid, equivalent to 

 19.1 of nitrate of barytes. 



This test is only to determine that there is no crystallized vegetable 

 patter uncombined with sulphuric acid in the sulphate of quina ; the de- 

 tection of earthy or alkaline sulphates has already been provided for. 



llthly. Sulphate of quina should lose not more than from 8 to 10 per 

 cent, of water by being heated till deprived of its water of crystallization. 

 Mr Barry informs me that he once examined a sample which contained 

 more than 40 per cent, of water in excess diffused through it. 



26. A New Method of Separating Manganese from Lime and Mag' 

 nesta* By Professor Stromeyer. — We are informed in a letter from 

 Professor Stromeyer, that he has found the following method successful in 

 procuring the complete separation of manganese from magnesia and lime. 

 To an acid liquid containing the peroxide of iron together with manga- 

 nese, lime, and magnesia, the carbonate of soda is added in the usual man- 

 ner, so as to precipitate the first, while the three latter oxides are held in 

 solution by an excess of carbonic acid ; and in order to prevent any man- 

 ganese from falling, the actual precipitation of the iron is effected by the 

 bicarbonate instead of the carbonate of soda. After acidulating the filter- 

 ed solution and concentrating it by evaporation, a current of chlorine gas 

 is transmitted through it. On neutralizing the free acid by the gradual 

 addition of bicarbonate of soda, the manganese subsides in the form of the 

 red oxide, being thus completely separated from the magnesia and lime. 



III. NATURAL HISTORY. 



ZOOLOGY. 



27. Baron Ferussacs Work on the Cephalopodous Mollusca. — A complete 

 Monograph on the Natural History of Cephalopodous Animals, is now pre- 

 paring for publication at Paris, by Baron Ferussac. The work is in folio, 

 and is illustrated by numerous drawings, taken chiefly from a very exten- 

 sive series of specimens in the possession of that distinguished naturalist. 

 Much confusion still prevails in the Natural History of this highly inter- 

 esting and remarkable tribe of molluscous animals, both in regard to the 

 characters of the species, and the synonyms employed by authors, which 

 we have no doubt will be removed by the labours of Baron Ferussac, who 

 has described an immense number of species, and has been at great pains 

 to examine the objects described. 



IV. GENERAL SCIENCE. 



28. Royal Medal adjudged to Sir H. Davy. — The Royal Society of Lon- 

 don has adjudged one of the royal medals to Sir H. Davy, for his method 

 of protecting the copper of ships' bottoms. 



29. Medal adjudged to M. Struve.-^The Royal Society has adjudged 

 a gold medal to M. Struve of Borpat, for his observations on double and 

 multiple stars. 



