264 Scientific Intelligence. 



Out of these numbers the following empiric formula for margaritinic 

 acid hydrate may be described : 



Calculated 



^60 ^59 ^5* 



Found. 





C 60 -300 

 II 59 59 

 5 40 



I- 



78-43 77-56 



12-85 7306 



8-72 9-38 



II. 



77-97 



12-52 



9-51 



10000 



in. 

 78-54 

 12-90 



8-56 



C 60 H 59 O 5 459 



10000 10000 



10000 



Fused with oxyd of lead it diminished in weight, and gave water on 

 heating it in a test-tube. 



The formula of the anhydrous acid would accordingly be 



and the hydrate : 



C 60 ^57 O3 . 



C 60 H 57 0,+2HO, 



containing two equivalents of basic water which can be replaced by 

 bases. 



Margaritinate of Potash. — This salt was obtained by saponification 

 of the acid with an excess of potassa, which process took place very 

 rapidly; after a few hours' standing, the potash salt separates from the 

 clear filtered soap solution as a soft cake. After washing it with cold 

 water, and pressing it between filtering paper, it dissolves easily in hot 

 alcohol, and separates itself on cooling in small white indistinct crys- 

 tals. This salt so obtained, was dried over sulphuric acid and in the 

 water bath, but remained unaltered ; on analyzing it, the following 

 numbers were obtained : 



I. 0*544 grm. potash salt gave 0*168 grm. sulphate of potash 

 0*090866 grm. potassa. 



II. 0421 grm. potash salt gave 0*137 grm. sulphate of potash 

 0*07409 grm. potassa. 



These numbers conduct to the formula : 



C 60 H 57 O 3 +2KO 



as results from the comparison of the found and calculated values : 



I alculated. Found 



. ^ , > 



1 equiv. marg. acid, zr441 82*40 



I. II. Average 



1 " potassa, = 94*23 17*60 16*70 17*60 IT 15 



53523 10000 10000 10000 100-00 



Margaritinate of Silver. — The best method to prepare this salt, is, 

 to dissolve the margaritinate of potash in alcohol, to dilute the solution 

 a little with water, and to decompose it with a solution of nitrate of 

 silver; it forms a light, white and curdy precipitate, becoming brown, 

 by exposure to the light, more so in drying it over sulphuric acid or in 

 the water-bath. This salt is easily soluble in ammonia and partly so in 

 water and alcohol. By analysis I obtained the following numbers : 



