ANALYSIS OF THE ROE OF FISHES. 275 



coated glass retort, 26 cent. [4 grs.] of phosphorus were pro- 

 duced. The residuum of the distillation weighed 4'2 gram. 

 [65 grs.], and still contained a great deal of phosphoric acid. 

 The muriatic acid, with which it was washed, yielded, on 

 the addition of liinewater, 4*5 gram. [6'9*5 grs.] of phos- 

 phate. It contained a little phosphate of magnesia. 



6. Messrs. F. and V. always remarked, that the coal of 

 llie roe calcined some time, and afterward once lixiviated 

 with water, yielded an acid liquor containing a little lime, 

 and a great deal of magnesia. These two phosphates are Separaiion of 

 easily separated by evaporation to dryness, and applynig wa- nhatesof lime 

 ter to the residuum, when the phosphate of magnesia will and magnssia. 

 dissolve, and that of lime be left behind. Ammonia sepa- 

 rates from this solution but a very small quantity, because 

 it forms a soluble triple salt with phosphate of ammonia. 



Sect. III. Distillation of the roe^ and examination of its 

 coal. 



1. The apparatus employed for this purpose consisted of ■^^^ *^'**'''*^* 

 a well tried stone retort, communicating, by means of an 

 adopter, with a glass receiver, from the tubulure of which 



issued a curved tube terminating in a phial full of oximu- 

 riutic acid. This was for the purpose of knowing whether 

 there were any phosphorus in the gasses evolved. The fire 

 was managed with a great deal of caution, and raised gra- 

 dually till the bMtom of the retort was at a white heat. 



123 gram. [l»99 grs.] of fresh roe yielded the following Products. 

 products; 



a, A great deal of colourless water; 



b, Some wliite, or slightly lemoncoloured, oil ; 



c, An oil as red as blood, and tolerably fluid; 



d, A blackish brown thick oil; 



e, At the same time with this oil some salts, which con- 

 densed in needly crystals on the sides of the adopter ; 



f, A white crust, mottled with yellow and red, adhering 

 to the upper part of the adopt,er; 



g, There was but little carbonic acid and carburetted hi- 

 drogen gasses evolved. 



2. We shall now examine the nature of these products. 



T 3 The 



