582 Analyses of Boohs. [MaT, 



case with the alkalies. But it appears, that when persevered in 

 improperly, after the tendency to deposite uric acid is removed, it 

 occasions a deposit of white sand in the urine, consisting of phos- 

 phate of magtiesia-and-ammonia, and phosphate of lime; and thus 

 gives origin to the foroiation of a new kiiid of calculus. In all 

 such C'ses, Mr. Brande shows that the use of magnesia must be 

 intermitted, and acids substituted in its stead. Muriatic, nitric, 

 and sulphuric acids remove the tendency to deposite white sand; 

 but they are apt to occiision disorder in the stomach, and to pro- . 

 duce irritation in the bladder. Vegetable acids correct the state of 

 the urine without being so apt to produce disagreeable symptoms. 

 Vinegar and citric acid were used successfully by Mr. Brande, and 

 carbonic acid was found to answer best of all ; as it had no tendency 

 to injure the stoinach or irritate the bladder, while it removed the 

 tendency in the urine to deposite a white sand. 



9. Additions to the Account of the Anatomy of the Squalus 

 Maximus, contiiined in a former Paper; with Observations on the 

 Structure of the Bronchial Artery. By Sir Everard Hotne, Bart. 

 F. R.b. This jwper consists of additions to and corrections of the 

 former paper on the same subject. In tlie former figure, a small 

 fin situated between the anus and tail was omitted, which induced 

 naturalists to suppose that the fish described was a peculiar species. 

 The pylorus portion of the stomach is very long and narrow. The 

 bronchial artery is muscular. This the author shows is intended 

 to regulate the t]ow of blood to the gills, when the fish is at differ- 

 ent depths. Fishes have no cerebrum, but only a cerebellum and 

 medulla oblongata. The medulla oblongata of the squalus maxi- 

 mus is very large. 



10. Some further Observations on a new detonating Compound. 

 • By Sir Humphry Davy, LL.D. F.R.S. V. P. R. 1. This sub- 

 stance, which Sir H. Davy proposes to call azotane, was discovered 

 by M. Dulong in France, but he did not investigate its properties. 

 It may be obtained by exposing dilute solutions of nitrate of am- 

 monia or sal ammoniac to chlorine gas. It is a brown coloured 

 oily looking substance, very volatile, and it does not congeal when 

 exposed to the cold, produced by a mixture of snow and muriate of 

 lime. Its specific gravity is 1-653. It gradually disappears in 

 water, azote being evolved and niuo-muriatic acid fora^.ed. When 

 put into concentrated liquid muriatic acid it disappears, and a quan- 

 tity of chlorine is evolved, considerably exceeding it in weight, at 

 the same time sal ammoniac is formed. In concentrated nitric 

 acid it gives out azote. In diluted nitric acid it gives a mixture of 

 azote and oxygen. It detonates in strong solutions of ammonia ; 

 in weak solutions it gives out azote. It dissolves in sulphurane, 

 phosphorane, alcohol of sul])hur, and fluoric acid, without any 

 violent-action. When exposed to pure mercury azote is evolved, 

 and a white powder formed consisting of a mixture of calomel and 

 coirosive sublimate. By a very ingenious analvsis, but on too small a 



2 



