THENOGENESIS IN THALICTRUM PURPURASCENS 373 
long ago shown by Strasburger’ to be cases of vege- 
wphora elongata Treub® has shown that there is no 
ion, but that a ‘‘pseud-embryo” is developed apoga- 
from the endosperm. » We see no reason why this whole 
 staminate Bowers, In the case of Shonidanesa phal- 
| Lotsy * also recently investigated, no seeds are ever 
He could not discover a pollen tube, nor could he 
ollen tubes to develop by artificial pollination. In a 
he secured some seeds, but was certain the embryos 
‘d from the eggs, probably after fertilization. oe 
that an embryo may be produced from any cell ae 
yO sac, and in this sense they may all be rega: jed ee 
eggs. But since the same fact is true of "celle: of — a 
the statement has little significance. Experimental 
‘Within the last five or six years upon the eggs of 
mals has thrown some light upon. the causes’ of the 
of unfertilized eggs. Mathews* showed that th 
38s of star-fish could be made to extrude pol 
Violent Shaking. Morgan‘ found that eggs placed in : 
~~ a higher osmotic pressure than normal sea weet 
Hpea ome returned to the latter. Mead bene that Pete 
_. mie. Jenaisch. Zeitschr. Naturwiss. 12 : 659. 1878. 
. cele et 'apogamie du Balanophora elongata. Aan, Bot Buiten- — 
8loboso. Ann. Jard. Bot. Buitenzorg 16 : —- iin: os 
2 Phalloides Jungh. 4. ete. Ann Jard. Bot. Buitenzorg cS a: co : 
9: 150, 1894. 
fir Entwicklungs, mechanik der pene 48. 1899. 
