M. C. Lea—Laboratory Notes. 377 
not precipitated from solutions containing citrate of soda.” Of 
argentic tartrate and monochromate, the same statement is made 
in the same words. Of argentic tartrate it is said still more 
strongly: “It cannot be precipitated from solutions which con- 
tain citrate of soda.” These citations * are all on the authority 
of Mr. John Spiller. 
n the course of some investigations connected with salts of 
2. Argentic Oxalate.—W hen oxalic acid is dissolved in a solu- 
tion of sodic citrate, even a single drop of silver solution pro- 
duces a permanent precipitate which does not disappear on 
warming or even boiling. 
_ 8. Argentic Tartrate——A considerable quantity of silver solu- 
tion can be added to one of tartaric acid before a Pps aos 
falls, It naturally follows therefore that when to a solution 
containing tartaric acid and sodic citrate we add a silver solu- 
tion, no precipitate is at first formed: when a sufficient quantity 
is added an abundant permanent precipitate is formed. 
Argentic Chromate-—When a little solution of neutral 
iling. : 
5. to a solution of sodice citrate be added silver salt as 
this solution 
long as the ipi b vnine 
precipitate dissolves by wa g, 
shows the following reactions. Chromate: A portion of the 
precipitate which does not redissolve. Even a drop of the 
olve. 
Solution i less the : 
; produces this effect, un daae- The wolation 
i ives a | tee which at 
first redissolves, but as more is added it becomes permanent 
and does not redissolve even by boil ar 
reactions, 
6. Finally, to a quarter of an { 
Sodie citrate, as ee silver was added as it a ta wet 
Into this a fraction of a drop of solution of neutral potassic 
.* They are not to be understood as being adopted by the author of the “ Dic- 
tionary,” who has simply collected all published statements. 
ounce of strong solution of 
