VOL. LXXII.] PHILOSOPHICAL TRANSACTIONS. 175 



Exp. 105. Regulus of Cobalt. Nor from this metal dissolved in the nitrous 

 acid. 



Exp. 106. Regulus of Nickel. Nor from this metal whether dissolved in the 

 nitrous or muriatic acid. 



Exp. 107. Arsenic dissolved in the nitrous acid, gave no precipitate on com- 

 mixtion with the acid of fat. 



Exp. 108. Manganese dissolved in the nitrous acid exhibited no change on 

 admixtion with this acid. 



The action of different acids upon Segner s salt* It has been already shown 

 that the vitriolic acid expels the acid from Segner's salt. 



Exp. 10Q. Nitrous acid. Upon 2 drs. of Segner's salt, Dr. C. poured an equal 

 quantity of double aqua fortis. No effervescence ensued. After subjecting the 

 mixture to distillation, the fluid in the receiver had the taste peculiar to the acid 

 of fat, but had somewhat of the smell of aqua f >rtis. But that the salt was de- 

 compounded and its acid let loose, was evident from the precipitation which took 

 place on adding some of the distilled fluid to a solution of lead in nitrous acid. 



Exp. 110. Muriatic acid. Equal quantities by weight of Segner's salt and 

 muriatic acid being mixed together, and subjected to distillation ; 2 drs. of acid 

 of fat were obtained, which possessed its peculiar smell, and precipitated a white 

 powder from corrosive sublimate. 



Exp. 111. Wine-Vinegar. Of this, 6 drs. were poured upon 2 drs. of Seg- 

 ner's salt, and the mixture was subjected to distillation. The distilled fluid had 

 the smell of vinegar, and produced no change in corrosive sublimate. 



Exp. 112. Fluoric acid being added in equal weight to this salt, it very 

 quickly united with it, and the compound appeared almost dry ; being afterwards 

 subjected to distillation with a strong heat, the fluid which passed over consisted of 

 fluoric acid unchanged. 



Exp. 113. Salt of phosphorus. Half an ounce of the sal phosphori dissolved 

 in water, was added to 2 drs. of Segner's salt. At the beginning of the distilla- 



* Relative to the figure of this salt, Dr. C. remarks that, on the authority of Segner, he had as- 

 serted in the preceding paper, that it resembled the terra foliata tartari ; but having afterwards pre- 

 pared it in larger quantity, and examined it more attentively, he found that the saline mass was 

 covered with a firm crust, to which, on removing it, there adhered many dagger-like Crystals 

 (pugionis quadrangularis forma) of which the 2 opposite sides were narrower than the others. These 

 crystals were for the most part 3 lines in length. If there be no excess of alkaline salt and the crys- 

 tals be dried on blotting paper, they do not deliquesce in the air : in which circumstance, as well as 

 in the form of the crystals, this salt differs remarkably from the terra foliata tartari. Dr. C. thinks 

 that Segner prepared so small a quantity of his salt, that he could not have an opportunity of ob- 

 serving the crystals concealed under the saline crust. Perhaps, too, his acid was not sufficiently freed 

 from the oily particles, and he might not have used for saturating the acid any other alkaline salt 

 than pearl ashes. 



