Intelligence and Miscellaneous Articles. 77 



^I'he formula of the metaterebates is C'" H'^ O". 2M0 ; those ob- 

 ' Itained by the author are the metaterebates of barytes, strontia, 

 potash, soda, magnesia and manganese. Tliey are perfectly soluble 

 in water, and most of them crystallizable. They are formed, either 

 by neutralizing the acid with the bases, or by double decomposition. 

 The metaterebates of zinc, nickel and iron, obtained by double de- 

 composition, are almost immediately converted into monobasic tere- 

 t)ates, and deposit half their bases. 



The formula of the diaterebates is C"H"'0^2M0. M. Caillot 

 has obtained the salts of lime, silver, copper and lead. All may be 

 prepared by double decomposition, but the diaterebate of lime may 

 be obtained by direct means. This last salt is soluble and crystal- 

 lizable ; the others are nearly insoluble. 



C. Compounds of Lead. — Besides the terebate of lead and the 

 diaterebate, M. Caillot has obtained several other remarkable com- 

 pounds. By dissolving two equivalents of oxide of lead in an equi- 

 valent of terebic acid, there is composed a salt C'' H^ C PbO, 2H0, 

 soluble in water in all proportions. This compound can part with 

 two equivalents of water and leave C^H^O'SPbO, 2PbO. 



On dissolving hydrate of lead in terebic acid, or still better, in a 

 concentrated solution of monoterebate of lead, a compound is obtained 

 which is soluble in water in all proportions.C"H'°0«5PbO = C'''H«0' 

 5PbO, 2H0. By long-continued ebullition the solution deposits 

 a new salt, the formula of which is C^' H^ CSPbO, 2PbO. A cold 

 solution of metaterebate of barytes dissolves a large quantity of the 

 oxides of lead and silver. New compounds are formed, respecting 

 which M. Caillot has promised future communications. From the 

 facts contained in this memoir it may be concluded — 



1st. That terebic acid combines with all bases so as to produce 

 monobasic salts. 



2nd. That when there is an excess of an alkaline base, this acid 

 combines with various proportions of water according to the nature 

 of the bases, to ccmstitute two new acids, namely, the diaterebic and 

 metaterebic, both of which are bibasic. ' 



3rd. That oxide of lead forms with the terebic acid several com- 

 pounds, among which are two that are without analogy in che- 

 mistry, and which the author is inclined to consider as performing 

 the functions of acids. 



4th. That the combination of water in the diaterebates and the 

 metaterebates appears to be the essential condition of the bibasity of 

 these salts. The author is of opinion that this proposition acquires 

 additional probability, on considering the facts observed respecting 

 the phosphates by Mr. Graham, and those respecting the phosphites 

 and hypophosphites by M. Wurtz, and the acids of antimony and 

 tin by M. Fremy. — L'Institut, Novembre 7, 1849. • ?»f-"^' ~" 



ON THE iETHEREAL COMPOUNDS OF TEREBIG'^Ldi^.^'*^^^ 

 BY M. A. CAILLOT. 

 The results obtained by the author with re«,'pect to the composition 

 of the terebates, induced" him to direct his researches to the aethereal 



