14S On ihe Sap of the Rose Tree. 



Sub-acetate of lead and oxalate of ammonia each occa- 

 sioned a precipitate. 



Twelve fluid ounces were evaporated, and afforded 7.25 

 grains of solid matter (a), which, being tested by sulphuric 

 acid, evolved fumes of acetic acid. 



To this (a) water was added and heat applied, apart only dis- 

 solved : the insoluble portion (6) weighed, when dry, 2.9 grs. ; 

 it was not acted upon by muriatic acid. Supposing it to be 

 oxalate of hme, a part of it = 0.3 of a grain was heated to 

 redness on platinum foil ; it left a white powder possessing all 

 the properties of lime. The remainder of the insoluble por- 

 tion (6), viz. 2.5 grs., was boiled in carbonate of soda, and 

 thus decomposed into oxalate of soda and carbonate of lime, 

 the latter weighed 1.9 gr., containing 1.064 of lime, being, 

 nearly, the equivalent of lime in 2.5 o( neutral oxalate, or 1.094. 



To the soluble part of (a) oxalate of ammonia was added, 

 until it ceased to give a precipitate; this being separated, 

 weighed 0.9 gr. ; it was oxalate of lime, and equivalent to 

 1.097 of acetate of lime in the soluble part of (a). The 

 remaining fluid yielded, by evaporation, a brownish viscid 

 mass ; this was digested in alcohol (sp. gr. 0.823), and it left 

 insoluble matter, which, dried and weighed, was = 2.1 grains, 

 and proved to be principally gum and extract. 



The alcoholic solution, when concentrated, gave indication 

 of potassa, by the application of muriate of platinum ; it was 

 then evaporated, and weighed 0.8 gr. When tested with sul- 

 phuric acid, the presence of acetic acid was manifested. It 

 was now heated to redness on a silver capsule, then acted 

 upon by water, filtered, and evaporated ; it left a little more 

 than 0.5 gr. of carbonate of potassa, equivalent to 0.7 gr. of 

 acetate of potassa. 



Therefore, collecting the results, it will be — 



7.25 



