- ?,9 - 
Aphi s pomi m-iy be ccntrollerl "by sprnying in spring, before 
the ior.vcs hcvo been curled, r/its* quo'-rsif" orulsior '.vitn sor.p. 
the cnulsion is proprrcd tj boiling 3 poundc of qiiasEia shr.vings in 
about 6 grillcns of water i'jr 2 or 3 hcar^ rjid adding 2 or 3 pounds 
of soft soap dissolved ir. a sinodl quantity of v/atcr to the strained 
liquor, 
OLITHTlI, v. (81) 
COITSTITUTIOIT 07 <^A53IK. Ga%. Chin, Itol. 17: 570-577. 
1887 J [in Italiai'ic Abst:\act i."^ O'our. Chom, Soc. [London] 
54: 1311. 1888.;! 
Of the acrivaoivcc of quasrin, qi.r.ssio acid seems 
to be the coi:i.po\ind best ada"ntod for i3.ve!jti£,rtion to obtain 
an in.-dght into tlv^ cnnstx tuti^n of qucstin. To jjroprre the 
acic' i': is advi cable to - per ate on snfll qumtities of quassin 
at a ti::i0 ('3 g-); thiu i;> hoatec^ at ICO'^ for 1 h.ov.T in a sealed 
tube v'ith h;-urochlorlc ac: 1 (40 cc.) '^^iii-.te-"'. with its o'^n volume 
of v/atcr. The solutior ic scparntcd from resinous natter by 
filtration and precipitated vith •';7ator. The proeipitate, after 
being v/ashcd, i^' c:ystrillizod noveral times froK c?lcohol, oy 
v/hich r.:caiis the unaltered quasnir. is easily sopr.ratod, as the 
quassic p.cid is c^:. paratxvoly irsolublo 5 n cold oloohol. 
Q,ua3sic acid, C3QK2;>C2_g, crystallizes in sr.all, color- 
less, ironoclinic prisms, containing 1 mol of water, which 
they lose at 100°. It melts with decomposition at about 244- 
245^, is soluble :' n boilirg alcohol, out only ajjaringly in cold 
alcohol and ether. It dissolves ir <3::;ricnia, a;-d in solutions 
of ellialine cerbonates with £i vtllcvz-color, more or less 
incli.ied to red. Its a!n*"oniac'>,l solution f^ives precipitates 
with inorcuric chloride, lead acetat^, copper sulpiiate, and 
ferric chloride, a:ud reduces silver nitrate; its aqueous 
solution is colored gree>iisn yellow by ferric chlorid-O, 
In a previous communication (18"^5;907) quassin was 
regprdrd cs the dimethyl ester of ^u'lssic acid. 'Jhis the 
author has now confirmed by proving: that methyl chloride 
is forned bv the action of hydrochlor^'c a.cic'. on quassin, and 
that quassic acid is dibasic. For this i-Airpose several of 
its s::lt3 were prepared and cnalyzed.. 3ariTim quassate, 
^30^-3o'-'l0 -^'^'-' "^2^' forms a yellowish-red, crystalline mass. 
The lead salt, ^ :;^(Y''Zo^10 ^^' ^^'^*^' ^^ throv/n down as a yellow 
precipitate, on adding lec?d acetate to a ner.tral solution 
of amv.ionium quassate; ferric quasst\te, i'^i^cp^.o^l^'^o ^^' is a 
brownish-green, amorphous precipitate. 
When a solution of hydro x-'l ran? ne hydrochloride is added 
(5 g, ) to quassic acid (10 g,), dissolved in sodium 
