138 Royal Society. 



Journal of an H oiticiiltural Tour in the Netherlands and North 

 of Franccjin the Autumn of 1817. ByP.Neill,J. Hay, and J.Mac- 

 donald, a Deputation of the Caledonian Horticultural Society. 



The Substance of the late Professor Dalzell's Lectures on the 

 Ancient Greeks, and on the Revival of Greek Learning, will soon 

 be published by his son, John Dalzell, Esq. Advocate. 



Illustrations of British Ornithology. By P. J. Selby, Esq. 

 Elephant folio. 



A Dissertation, showing the identity of the Rivers Niger and 

 Nile ; chiefly from the authority of the Ancients. By J. Dud- 

 ley, M.A. 



An Itinerary of the Rhone, including part of the Southern 

 Coast of France. By J. Hughes, Esq. A.M. of Oriel College, Ox- 

 ford. 



Manual of Mineralogy. By Prof. Jamieson of Edinburgh. Svo. 



Flora Scotica ; or A Description of the Plants indigenous to 

 Scotland and the Isles. By Prof. Hooker of Glasgow. 1 Vol. Svo. 



A Practical Treatise on Diseases of the Heart. By Henry 

 Reeder, M.D. Extraordinary Member of the Royal Medical So- 

 ciety of Edinburgh, and'Member of the Medical and Chirurgical 

 Society of London. In which is comprised a full account of all 

 the diseases of that organ, as the Inflammatory, Organic, and 

 Svmpathetic, together with their appropriate modes of treat- 

 ment ; also an account of Malconformations of the Heart, Aneu- 

 'rism of the Aorta, Pulsation in Epigastris, &c. 



J. B. Benwell intends shortly to publish an Essay on Interest 

 Annuities, chiefly on deducing the values, when payable by instal- 

 ments at intervals periodically fractional to yearly ; as half yearly, 

 quarterly, monthly : with Notes and Illustrations, and a brief In- , 

 troduction on the study and practice of Life Assurance. 



XXI. Proceedings of Learned Societies. 



ROVAL SOCIETY. 



Jan. IS. Inquiries relative to the urinary organs and secretion 

 of two species of Rana, common in Ceylon, by Dr. Davy, were 

 read. From the statements of the author it appears, that the 

 bladder of the bull-frog and brown toad (the two species in ques- 

 tion) is a genuine receptacle for urine, which it receives from the 

 cloaca in which the ureters terminate ; and that their urine is not 

 at all analogous to that of other animals of the order of amphibia, 

 being very dilute, containing urea and certain salts, but no appre- 

 ciable quantity of lithic acid. This is the more remarkable, as 

 the favourite food of these animals is the same as that of small 

 lizards, whose urine is of a butyraccous coasisteucc, and nearly 



V)UIC 



