1808] SOCIETY FOR PLANT MORPHOLOGY AND PHYSIOLOGY rat 
before delimitation of the egg within the oogonium, and disap- 
pears after fusion of the male and female nuclei. It probably 
plays some part in these two phenomena. 
Both of the organoids have been observed before, but were 
not correctly described by previous writers. 
9. Notes on the archesporium and riucleus of Bignonia: Mr. B. M. 
Ducear, Cornell University. The mature archesporium of the 
microsporangia occupies a single boot shaped layer. The prim- 
itive archesporium is differentiated by periclinal divisions in cer- 
tain regions of the outer layer of periblem. The tapetum on the 
outer side is cut off by the next periclinal divison of the hypo- 
dermal layer, and the next division of the latter gives rise to the 
layer often becoming the fibrillar endothecium of anthers, but in 
Bignonia there is no fibrillar development. In general, there are 
" further periclinal divisions in the regions mentioned. The 
definitive archesporium is formed by not more than a single 
division in some or all of the primitive archesporial cells. The 
oo archesporium apparently develops no primary tape- 
i ne ee emusly from the two-celled stage, the third 
The gts becoming the definitive embryo-sac mother cell. 
Re sec nucleus, especially, is peculiar in the large 
“like structure which does not stain homogeneously, 
the 
cuter portion usually taking the violet in the Flemming 
combination, 
— . theories of heredity and of the origin of species consia- 
- SWINGLE to the phenomena of hybridization: MR. WALTER fe 
the speake partment of Agriculture.— Owing to limited time 
bearing of nega only the first portion of his theme, viz., the 
It was ics \ oi of hybridization on some theories of heredity. 
Mosomes out that Weismann’s theory of reduction of chro- 
ences a, giving a plausible explanation of the differ- 
_ Morphic) w between the first (uniform) and second (poly- 
With the “Saami of most hybrids, is not only in disaccord 
®>served phenomena of spore and pollen formation in 
