4 58 Notices respecting Neiv Books, 



other chemists, how extremely variable they are in their 

 composition, and consequently how probable it is, that the 

 greater part of them are to be regarded as mixtures ; al- 

 though it be also possible, that there may exist a triple car- 

 bonate of lime and iron as a strict chemical compound. 



It seems not unlikely, that there may hereafter be found 

 some carbonate allied to ihe preceding, which may owe its 

 form to the presence of manganese : but notwithstanding 

 the liberality which happily prevails in general amoifg those 

 who have it in their power to assist in such inquiries, I 

 have not had the good fortune to meet with any such com- 

 pound ; and I am unwilling, merely in the hope of mak- 

 ing such an addition, any longer to defer communicating 

 an observation, which I hope will be of real utility in the 

 discrimination of bodies that difler so essentially in their 

 composition. 



LXXII. Notices respecting New Books. 



-t ART I. of the Philosophical Transactions of the Royai 

 Society for 1812 has just made its appearance. The follow- 

 ing are its contents : 



I. On the Grounds of the Method which Laplace has 

 given in the second Chapter of the third Book of his Me- 

 canique Celeste for computing the Attractions of Spheroids 

 of every Description. By James Ivory, A.M. Commu- 

 nicated by Henry Brougham, Esq., F.R.S. M.P. — 2. On 

 the Attractions of an extensive Class of Spheroids. By J. 

 Ivory, A.M. Communicated by Henry Brougham, Esq. 

 F.R.S. M.P. — 3. An Account of some Peculiarities in 

 the Structure of the Organ of Hearing in the Balasna My- 

 sticetus of Linnaeus. By Everard Home, Esq., F.R.S. — 

 4, Chemical Researches on the Blood, and some other Ani- 

 mal Fluids. By William Thomas Brandc, Esq., F.R.S. 

 Communicated to the Society tor the Improvement of Ani- 

 mal Chemistry, and by them to the Royal Society -5. Ob- 



.servations of a Comet, with Remarks on the Construction 

 of its different Parts By William Herschel, LL.D. F.R.S. 

 — 6. On a gaseous Compound of carbonic Oxide and Chlo- 

 rine. By John Davy, Esi]. Communicated by Sir Hum- 

 phry Davy, Knt., LL.D., Sec. R.S. — 7- A Narrative of the 

 Eruption of a Volcano in the Sea off the Island of St. Mi- 

 chael. By S. Tillard, Esq., Captain in the Royal Navy. 

 Communicated by the Right Hon. Sir Joseph Banks, Bart. 

 K.B. P. R.S. — 8. On the primitive Crystals of Carbonate 



of 



