294 M. Chevreul's Chemical Examination of ttoo [April, 



animoniaco-tnagnesian-phosphate ? These questions I cannot 

 answer. 



29. As to that part of the matter insoluble in alcohol which 

 was not dissolved by cold water (22), it consisted of sulphate of 

 lime, phosphate of lime and magnesia, silica, and yellow colour- 

 ing principle. 



'60. It is not impossible that there were other substances 

 besides those which I have mentioned, in the matter of the soil 

 of Kiihloch, soluble in boiling water; but the small quantity of 

 the substance which I possessed did not allow of my ascertaining 

 whether any such really existed in it. 



Article II. — Examination of the Matter undissolved by Boiling 



Water. 



31. The portions of the specimens A and B undissolved by 

 boihng water were both separated by means of levigation (elu- 

 triation ?) into pulverulent matter and sandij matter. 



32. The pulverulent matter of specimen A differed from that 

 of B in being of a lighter colour; they were both of an amber 

 tint, and were mixed together. 



33. The sandy portions of the two specimens being perfectly 

 similar in their physical properties, they were also mixed. 



1. Pulverulent Matter. 



34. It did not sensibly impart colour to cold water, but gave 

 a slight yellow tint to boiling water ; it was repeatedly treated 

 with boiling alcohol. 



35. The tirst alcoholic washings filtered while hot deposited 

 a flocculent substance on cooling ; the washings being mixed 

 were evaporated nearly to dryness, a nearly colourless substance 

 was obtained which was partly fusible ; it was treated with a 

 hot solution of potash, and this liquid was afterwards filtered. 



36. This alkaline solution was neutralized while hot by muria- 

 tic acid ; some drops of oily matter were obtained which solidi- 

 fied on cooling : this substance appeared to be stearic or 

 margaric acid ; for it was dissolved by hot solution of potash, 

 and which, when mixed with cold water, deposited a pearly 

 substance. 



37. The residuum insoluble in potash (35) was treated with 

 hot alcohol and some flocculent azotized matter [matiere azotee) 

 was separated, and a fatty matter dissolved which melted into 

 perfectly limpid and colourless drops, and solidified like bees 

 wax ; this substance, when boiled with a solution of potash, 

 formed an emulsion rather than a solution : it is probable that 

 it consisted of fatty saponifiable and saponified matter, and 

 some which was not saponifiable. 



38. The pulverulent matter which had been washed with 



