841 



the apex oi' the young' rolled-up leaves. Tliis is the onl,y one of the 

 three factors whieli becomes se[)arately visible. When il is present 

 heterozjgotically, segregation takes plac'c in the proportion of 3 with 

 and 1 without, for example, from II 4 — 2 (green) — 3 I obtained 

 46 large plants, of which 35 had the narrow red edge and 11 were 

 without it. In the same way out of 35 specimens from /t 13 — 1 — 1 

 (^green) 27 had it and 8 were without it. 



In jP2 of the crosses this segregation is also seen. Of 125 "green" 

 examples of {R4:—l)y^{Gll — D)Rl I obtained only 51 in bloom, 

 the others died by the continuous rain. With segregation in the 

 proportion of 27 : 37 (see the table) 37 — 16 =: 21 j^lants must occur, 

 which show the nai-row red edge, as against 16 real '"green" ones. 

 Calculated according to the proportion the number of those with 

 the narrow red edge is 28.94 and of "green" ones 22.05. The 

 figures found were 30 and 21, certainly a sufficient agreement. It 

 is perhaps not urmecessary to add that the 6 specimens which 

 remained from the 16 "green" ones from (7^4 — 7 X (^ ^ — ^) ^^^^ 

 were really "green", without the narrow red edge on the leaves. 



New crossings of the same two forms but of different origin 

 have in the meantime been made, as also the crossing of 7^13 — 4 — 3 

 with C a n n a g 1 a u c a, which differ in at least ten characters and 

 probably in still more. The whole i'^l gener-ation is however up 

 to the present only one specimen, of which the fertility is still 

 doubtful. The leaf shape is intermediate between that of the parents; 

 the leaves have still sometliing of the wax-like appearance of the 

 mother and the red edge of the father. 



Mexlan [Sumatra), January 1914. 



Chemistry. — ''Equilibria In ternary systems." XII 1. By Prof. F. 



A. H. SCHREINEMAKERS. 



Now we consider the case, that the substance F is one of the 

 components ; it is evident that we can deduce then the saturation- 

 curves under their own vapourpressure and the boilingpointcurves 

 in the same way as is done in the previous comnmnications for a 

 ternary and a binary compound. 



We take the component B as solid substance and now we choose 

 a T and P in such a way, that no vapour is formed and the 

 isotherm consists only of the saturatioucurve y.v of fig. 1. On decrease 

 of pressure anywhere a gasregion and the region L(t occur. These 

 regions may arise in different points ; in tig. 1 the region L(J, the 



54* 



