164 Mr. W. Francis's Chemical Examination of the 



stellate groups strongly resembling some kinds of Wavellite, 

 and has a shining white colour. It may easily be reduced to 

 a fine powder; it is very soluble in warm weak alcohol, from 

 which nearly the whole quantity separates on cooling; the so- 

 lution has strong acid properties. 



The acid obtained in the above manner is the hydrate ; the 

 anhydrous acid has, according to the analyses of several of its 

 compounds, the following composition : — 



Calculated for 100. 



35 atoms Carbon 2654*89 78*57 



68 ... Hydrogen 424-30 12*55 



3 ... Oxygen 300*00 8*88 



3379*19 100*00 



The composition of the hydrated acid in the state in which 

 it is separated from the salts, and likewise occurs free in the 

 kernels, was determined in the following ultimate analyses : — 



i. 0*275 grm. of the hydrated acid gave 0*757 carbonic acid, 



and 0*312 water. 

 II. 0*294 grm. of the hydrated acid gave 0*8054 carbonic 



acid, and 0*337 water, 

 in. 0*224 grm. of the hydrated acid gave 0*613 carbonic 



acid, and 0*252 water, 

 iv. 0*331 grm. of the hydrated acid gave 0*913 carbonic 



acid, and 0357 water. 

 v. 0*242 grm. of the hydrated acid gave 0*667 carbonic acid, 

 and 0*272 water. 

 In No. i. the combustion was effected by chromate of lead, 

 in the remainder oxide of copper was employed. No. v. is 

 an analysis of the hydrated acid as it occurs uncombined in 

 the grains ; it was still coloured somewhat yellow, but was 

 quite crystalline, and had the same melting-point as the per- 

 fectly white hydrate. 



The above numbers afford in 100 parts, — 



I. II. III. iv. v. 



Carbon 75*71 75*32 75*24 75*84 75*79 



Hydrogen... 12*60 12*73 12*50 11*98 12*49 

 Oxygen 11*69 11*95 12*26 12*18 11*72 



100*00 100*00 100*00 100-00 100-00 

 These closely approach the formula C 35 H 70 O 4 . 



In 100 parts. 



35 atoms Carbon 2654*89 76*04 



70 ... Hydrogen ... 436*78 12-51 



4 ... Oxygen 400-00 11-75 



3491*67 100-00 



