56 Chemkal Examination bf the Pollen 



lowish white, which weighed when dried two grammes 

 and a quarter, and which was reduced to one gramme and a 

 quarter by calcination ; it was then black hke charcoal 

 dust. This substance exhaled while on the fire the smell of 

 burnt horns mixed with that of anitnonia, but without 

 softening or rpelting like horn. When exposed to the blow-r 

 pipe it first became black, afterwards white, and melted at 

 last into a brilliant white globule, of a very lively phosphoric 

 Justre. 



This same matter not soluble in water was dissolved i^ 

 the nitric and muriatic acids without effervescence; limer 

 water and ammonia gave precijitates from these acids in white 

 gelatinous-like flakes. Oxalate of ammonia produced in 

 the acid solutions a pulverulent and granulous precipitate. 

 Sulphuric acid decomposed the same matter without disr 

 solving it: after having boiled it for sorne time with this acid 

 diluted in water we filtered the liquor, and washed the solid 

 mass with cold water ; we afterwards boiled ii with a great 

 quantity of water, which produced the complete solution of 

 it J oxalate of ammonia formed oxalate of lime with it, and 

 muriate of barytes formed sulphate of barytes. 



Thus one of the elements of this substance treated with 

 sulphuric acid was in reality lime. The acid to which thisi 

 earth was united was ascertained by the followintj experiT 

 ments : ammonia formed in it a gelatinous precipitate in 

 abundance ; and lime-water, when poured into the liquor 

 decanted from off this prepipitate, produced a r;evv one in 

 every respect resembling phosphate of lime. It is therefor*? 

 certain that the lime found in this substance by the prece- 

 ding experiments was united to phosphoric acid. The poUcu 

 of the date tree, therefore, contains phosphate of lime, which 

 was dissolved, in water. We shall presently see that it con- 

 tains even more than the quantity mentioned, and that it is 

 accompanied by another phosphoric salt. 



§ V. Eo^amhfatmi of the Portion of the Extract of Pollen 

 not soluble in Alcohol a,n,d soluble in [Vater, 

 It has been remarked, that the portion of the extract of 

 pollen not soluble in alcohol was separated into two by the 



watev. 



