Ixx __ Historical Sketch of the Physical Sciences, 1818. 
15. Colouring Matter of Red Wine.—This colouring matter is 
distinguished from every other upon which M. Vogel has made 
experiments by the property which it has of forming a greenish 
grey precipitate with acetate of lead. By this property we can 
distinguish whether a red wine is genuine or factitious.—(Ibrd. 
. 232.) , 
Wroter ei 05s 26 ae i ediG + B2POE Si 
PAPANCI Ne he eeu tales ep ae a ae 84:00 tase: 
Sugar (identical: with common sugar) 30-00 
Woody fibre... 2... 050 rarest ai7'e6 1 DVSDO 
Animalized matter. scr. cee se eeeees “15°00 
Albumen. 6. LEV ka 28 PREIS . 14:00 
Oxalate of lime....; Seamer re war - 80 
Rancid oil f 
Adipocere pooes eee neeree ee ee 0°90 
Phosphate of lime..... Vewsa io cbe SRR 
Sulphate of potash -......0.0+0- 0°22 
Malate of potash. ..... bea ia Sas 0°20 
~ Phosphate of potash.......... sits ONE 
Muriate of potash..... Soe lone Pen 
"=~ Odorous principle. 
—(Ann, de Chim. et Phys. viii. 241.) 
17. Menispermum Cocculus—Boullay has published a new set 
of experiments on this substance, from which he had previously 
‘extracted the substance, to which he has given the name of 
‘picrotoxine. From these new experiments it appears, 
(1.) That the picrotoxine is not only a new substance, and 2 
very dangerous vegetable poison when in the pure and crystallized 
state; but likewise a salifiable base, capable of neutralizing 
acids, and of forming well characterized salts. The sulphate of 
picrotoxine, for example, is composed of 
Acid NPR fcr 10 eeee 5 
Pigrotexine os ocsesiee 0) oaee 45 
ee ih 
From this composition it would appear that the equivalent 
number for picrotoxime is 45. -It is therefore the heaviest of all 
the alkaline bodies, and ofcourse capable of saturating the 
smallest quantity of acids of any salifiable base at present 
known. ie os 
