EXAMINATION OF JALAP RESIN. 23 
ART. VII. —EX A M IN ATIO N OF JALAP RESIN. 
BY G. A. KAISER. 
Besides the ordinary Jalapa tuberosa or ponderosa, 
which occurs from the size of a nut to that of a fist, and 
which is derived from Ipomoca Schiedeana, Zuc., there is 
also met with at present another kind derived from Ipomcea 
orizabensis, which is paler, more fibrous, has a fainter 
smell and taste, and is known by the name of Bad. Jalapx 
fusiformis s. Isevis (Stipifes Ja lapse). The resins from 
both agree, and are thereby distinguished from all other 
resins with which they might possibly be adulterated, in 
their being gradually dissolved by concentrated sulphuric 
acid, and depositing after some hours a brown smeary 
resin. Both are however essentially distinct. The resin 
from Ipom. orizabensis is simple and entirely soluble in 
aether ; this was examined by Johnston, and found to be 
C 4o H 34 i8 . the ailt hor found C 42 H 34 O 18 , and calls it 
rarhodeoretine. The resin from Ipom. Schiedeana con- 
sists, on the contrary, of a soft resin soluble in aether and a 
resin insoluble in aether, which the author terms Rhodeore- 
tine, which is identical with the Jalapine of Herberger and 
Buchner, but does not possess the properties of a base, but 
those of an acid, is decomposed by concentrated acids like 
salicine into grape-sugar and Rhodeoretinole = C 42 H 35 O 20 , 
and gives an hydrate and various salts. This resin has 
likewise been examined by Cadet de Gassicourt and Gcebel. 
Rhodeoretine : Preparation. — The root of Ipom. Schie- 
deana was treated with alcohol of 0.863 spec, grav., the 
extract mixed with water, and the alcohol removed by dis- 
tillation ; the dark brown resin was separated, boiled with 
water, and then washed with hot water as long as anything 
was removed, upon which it was again dissolved in alcohol 
of 0.863 spec, grav., and the solution digested two or three 
