E. Regel on Parthenogenesis. 311 
ence of fecundation. But if the fecundation rs prevented, in certain 
cases an embryo may be nevertheless developed.” Strictly speaking, 
therefore, it was assumed in this statement that the male sexual 
— of plants were wholly superfluous structures. - 
_ But this assertion was made always in reference only to par 
ticular plants, and indeed to the same with which Spallanzani 
had experimented in the year 1786, namely hemp and spinach.* 
How inexact Spallanzani’s observations must have been, appears 
from the fact that he obtained ripe seeds even from basil from 
which he had removed the anthers, also from watermelons, &e. 
On these latter and similar plants, on which it is easy to ope- 
tate, there exist a number of direct experiments to show that 
fect 
Plants. From his superficial observations he drew the conclu- 
srg all annual plants with separate sexes could form perfect 
without fecundation. By such a wise contrivance, nature 
Prevented the dying-out of such plants. 
So far is stillin very few hands in flowering condition. 
7 28 we know, it has not been observed, from the period of - 
Obsenne to the ripening of the fruit, by any German botanist. 
ats — on the so-called unfecundated seeds, such as were 
condit: y Radlkofer, Klotzsch, and A. Braun, can have buta— 
sare importance. That all has not been seen that may be 
rt ag oa er is evident from the fact that while Klotzsch 
erm , from the formation of the seed of this plant, that 
fers hed not an embryo at all, but a bud, Radlkofer and A. 
tia of the ame opinion. The latter, however, made 
tition observation, still unexplained by him, namely, 
Crip.) oon 4 @ pollen-grain with a pollen-tube on the stigma of 
* . 
ints epee 
! Otto und erg 
| d Dietrich, Allg. itung, 1889, pp. $27, 329. 
Trans, Linnean Society of London, 1841, p. 509, 
pour servir 4 l’Histoire de la Génération des Animaux 
