145 



and that the detection of the element under notice in marked quanti- 

 tity in plants, prepares us for the recognition of fluorine as a con- 

 stant ingredient of the tissues of animals, who receive it both in their 

 solid food, and in the water which they drank. The author, how- 

 ever, forbore to enlarge, upon the application of his discovery of the 

 wide distribution of fluorine, till he analysed an additional number 

 of substances for it. 



The following Donations to the Library were announced : — 



The Nature and Treatment of Diseases of the Heart. By James 



Wardrop, M.D. 8vo. — From the Author. 

 Twentieth Report of the Scarborough Philosophical Society. — 



8vo. — From the Society. 

 Minutes of Proceedings of the Institution of Civil Engineers. 



1849-50^-1850-51. 8vo. 

 List of Members of Ditto. — From the Institution. 

 Assurance Magazine. No. 7- 8vo. 

 Constitution and Laws of the Institute of Actuaries of Great Britain 



and Ireland. 8vo. — From the Institute. 

 Transactions of the Cambridge Philosophical Society. Vol. IX. 



Part 2. 8vo. — From the Society. 

 The American Journal of Science and Arts. Second Series. 



No. 38. 8vo. — From the Editors. 

 Flora Batava. Aflevering 168. 4to. — From the King of 



Holland. 



VOL TIT. 



