( 1477) 
a. 98.36 0 0 1.64 0 Na,SO,.10H,O 
a 95,83 2.24 () 1.93 0 Na,SO,.10H,O-+-CuSO,.5H;0 
£9583 204 0 1,93 0  NaySO,.10H,0+CuSO,.5H,0 
2S 95861 2009 0 1.502 0538 nt duel od 
u. 95.991 2038 0 1.094 0.967 NagSO,.10H,0 +CuSO,.5H,0 4 D 
t. 95.83 9.24 0 1.93 0 Na,SO,.19H,0-+CuSO,.5H,0 
di | OTB Ooh 0 0 0 CuSO,.5H,0 
u. 95.901 9.038 0 1.994 0,967 NagSO,.10Hg0+-CuSO,.5H,0+D 
95.572 9,032 0.277 0 2.119 CuSO,.5H,0+D 
94.701 4458 2437 0 9.004 ' SEN 
= 04483 1060 2533 0 1.974 k welp 
= 03466 « 0778, 14192 0 1.869 i ns 
99.056 0508 5.628 0 1.718 dk 
O18 0.593 6,652 0 1,707 4 4 
n. 90.023 0.455 7.959 0 4.563 CuCl,.2H,O+CuSO,.5H,0-+-D 
d 9189 244 0 tee CSO . | ain 
Cone Oi. 0231 BTA 1,0 0 CuC12.2H,0 + CuSO, 5H20 
siirface D. 93365 0.62) 8,325 0 en oe ee Ly af 
In most cases the appertaining residues at 15°, 25°, and 35° have 
been analysed as well as the solutions, and the solid phases with 
which the solutions were saturated have been deduced therefrom 
by means of the usual method. 
(To be continued). 
Chemistry. — “Hypaphorine and the relation of this substance with 
tryptophane”. By Prof. P. van ROMBURGH. 
(Communicated in the meeting of March, 25, 1911). 
In the seeds of Erythrina Hypaphorus Boerl. (Hypaphorus subum- 
brans Hassk.) which, under the name of “dadap minjak” is generally 
cultivated, in Eastern Java, as a shading tree in coffee gardens, 
GresHorr') has found a poisonous alkaloid. 
In the end of 1891 Dr. Grrsnorr had invited me to take in 
hand, jointly, the study of this alkaloid in order to determine 
its structure. Shortly afterwards Dr. Gresnorr was obliged, in the 
course of 1892, to return to Europe. In the beginning of 1892 I 
1) Mededeelingen uit ’s Lands Plantentuin 7, 29 (1890), 
