372 Morphologie etc. — Varietäten etc. 



Parthenocarpy ac^ompanies the development of the embryoless 

 seed of normal structure. 



On one and the same stock the aitionomic parthenocarpic fruit 

 dehisces later than the autonomic, and in turn the latter dehisces 

 later th,itt the normal fruit. However, the latest dehiscence takes 

 place, in the autonomic parthenocarpic fruit developed on the un- 

 poJUnated stock bearing a reduced number of flowers. 



' The seed-coat and the embryo can be brought to füll develop- 

 ment more or less independent of each other and of the fruit-wall. 



Its own or foreign pollen-tubes do not promote the ovarial 

 development alone, that is, without inducing the promoted develop- 

 ment on more or less numbers of the ovule. 



In the abscised flower the fertilized ovules can develop into 

 normal seeds, while the ovary remains in all essentials as at the 

 fertilization stage. This may afford an example of the acarpous 

 seed formation. 



At delayed fertilization of the ovule the synergid tends to 

 develop into an adventitious embryo. In this case fusion between 

 the male and synergid nuclei is highly probable. 



Under a special condition the haploid egg may undergo the 

 nuclear division leading to the generative parthenogenesis, but no 

 cell division is ascertained. M. J. Sirks (Bunnik). 



Nohara, S., Genetical studies in Oxalis. (Journ. Coli. Agr. 

 imp. Univ. Tokyo. VI. p. 165—182. 1915.) 



The diversity of forms of Oxalis corniculata L. in Tokyo and 

 its vicinity was studied by the writer in respect to their relationship 

 from the genetical point of view. He classified the forms at first 

 into 4 groups according to their most apparent distinguishable cha- 

 racters and designated them as Type I, II, III, IV. The chaiacteri- 

 stics of these t3^pes were: 



Corolla. Leaves. 



I. Lemon yellow throughout. Alniost quite green. 



IL Yellow throughout. Purple green. 



III. Yellow, but each petal has a Purple green. 

 dilute purple bar near the throat, 



so that the corolla has the so- 

 called eye. 



IV. Gamboge, but each petal has a Dark purple green. 

 deep purple bar near the throat, 



so that the corolla has a deep- 

 purple eye. 



In the further researches a fifth type was found, which was 

 characterized by petals a little smaller than those of II and yellow 

 and leaves which afe also somewhat smaller and green like those 

 of I except in their margin, which is tinged with purple color. 



The crossings, made by the writer, led him to the following 

 conclusions: 



The purple color is due to the presence of the purple cell-sap 

 in the cells of which the purple eye and spot on the leaves are 

 composed. 



By pedigree culture and cross-testing I, II, IV and V were 

 found to be pure types, while III is not pure, it split into IV and 

 V by self-fertilization. 



In hybrids of these types the presence of factor or factors of 



