10 



Mr."Thomson's Analysis of Two Species of Upiphytes. 



stances 3*05 grains, the whole amounting to 7*27 grains, there being 

 thus an excess of *13 grains. 



Muriatic acid was next poured on the insoluble portion, when a 

 violent effervescence took place, and only *77 grains remained undis- 

 solved. By fusing this with carbonate of soda, and adding muriatic 

 acid in the ordinary way, there wero found to be *60 grains of silica. 

 The whole quantity dissolved in muriatic acid was now mixed, and 

 ammonia was added. A precipitate fell, which was boiled with caustic 

 soda to remove alumina What remained was peroxide and phosph. of 

 iron ; it was dried, and found to weigh -22 grains. The portion dis- 

 solved by the caustic soda was precipitated by the addition of muriatic 

 acid, the excess of which was removed by adding carbonate of soda. 

 There were thus found to be '44 grains of alumina, or phosphate of 

 alumina. 



To the washings oxalate of ammonia was added, and after filtering 

 and burning, the precipitate weighed 2*90, which was carbonate of lime. 



The next point was to determine the composition of the salts 

 soluble in water. By accident this part of the process was not com- 

 pletely executed. The only constituents which were determined were 

 the sulphuric acid, the potash and the soda, the first of which was 

 found, by precipitating with nitrate of barytes, to weigh *92 grains. 

 The potash and soda were separated by means of bichloride of plati- 

 num and found to weigh respectively "24 grains and -94 grains. 



The following is a statement of the entire results : — 



grs. 



Water, 281*14 



Organic Matter,64*77 



grs. 



grs. 



Ashes, 7*14< 



{Sulph. Acid, -92 

 Potash, -24 

 Soda -94 



Chlorine, &c *95 



Silica, -60 



Peroxide and 



. Phos. of Iron, 

 Insoluble m Water, 4-22 <! Alumina> 



:.} 



•22 



or 



41 



Phosph. of Al. } 

 L Carb. of Lime, 2-90 



Entire plant, 353-05 7-27 



100 parts of the plant would contain — 



Water, 7964 



Organic Matter, 18*34 



Ashes, 202 



100-00 



