300 Mr. Grahams Catalogue of Plants 



were carefully evaporated to dryness, and the residual salt 

 weighed 13*23 grs. Knowing the composition of this salt 

 or Bitartrate of Potash, we obtain the following result : 

 Oxide of antimony . . . 45*92 



Potash 12*80 



Tartaric acid 35*25 



Water . . ^ 4*84 



98*81 

 Resolving these weights into atoms we have for the 

 constituents of the salt, 



Oxide of antimony . . 4*83 = 2*26 atoms. 



Potash 2*13 = 1*00 „ 



Tartaric acid .... 4*27 = 200 „ 



Water 4*30 = 2*01 „ 



The result of Dr. Thomson's analysis was, 

 1*997 atom Tartaric acid. 

 1*92 atom protoxide of antimony. 

 1 atom potash. 



2*139 atoms water. 

 The mean of the two analyses as below, 



Oxide of antimony .... 2*12 



Potash 1*00 



Tartaric acid 1*96 



Water 2.07 



leaves no doubt as to the following being the true compo- 

 sition of the salt : 



2 atoms oxide of antimony . . 19*00 



1 atom potash 600 



2 atoms Tartaric acid .... 16*50 

 2 atoms water 2*25 



43*75 



Article VII. 



Catalogue of Plants Collected at Bombay. By John 



"Graham, Esq. 



{Concluded from page 198.) 



309. Moraea ckinensis. 



310. Mentha perilloides 



311. Marsilea 4-folia 



