1823.3 071 the Uncertainty of Chemical Analysis. 391 



The results were as follows, and I trust they will be considered as 

 offering satisfactory evidence that similar results are obtainable 

 by using either of the salts in question, and that they may be 

 indifferently employed for the purpose of ascertaining the quan- 

 tity of sulphuric acid. 



Sulphate of Barytes by Nitrate. 



Exper.l 128-7 grs. 



2 128-0 



3 ,, 128-3 



4 •.,... 128-6 



613-6 

 Mean 128-4 



By Muriate of Barytes. 



Exper. 1 128-1 grs, 



2 128-7 



3 128-0 



4 1285 



613-3 

 Mean 128-326 



Article XII. 

 Analyses of Books. 



Transactions of the Limiean Society of London. Vol. XIV. 

 Part I. 1823. 



This part of the Linnean Transactions consists of eleven 

 papers, of which the following are abstracts or analyses : — - 



I. On the Malayan Species of Melastoma. By William Jack, 

 MD. Communicated by Robert Brown, Esq. FRS. and LS. 



" The East Indian species of Melastoma^' Dr. Jack observes, 

 " have been Httle investigated in their native soil ; and the few 

 that are mentioned in botanical works have for the most part 

 been so imperfectly described as to occasion much confusion. 

 This splendid genus has now become so extensive as to require 

 being subdivided ; but to do this with due regard to the natural 

 series, and to the relative importance of the characters, would 

 demand a critical examination of the whole, and ampler means 

 of reference than are accessible in India. I shall, therefore, 

 confine myself to such observations as have been suggested by 

 the Malayan species -which I have had an opportunity of exa- 



i; 2 



