before the Linnean Society, May, 1873. 247 
those in which the vascular system has been perfected.* And 
yet we must believe this if we admit Strasburger's pedigrees. 
We must suppose that races, after having once secured the ad- 
and their union in the other within a set of floral envelopes, 
their progress was thenceforth in different directions, and homol- 
ogy in a great measure disappeared. In Coniferze this complete 
separation of the sexes and fertilization through the agency of 
the femal i + point established by 
ale flowers. Accordingly one great po assem: 
1 Ue ee 
bats neni | een esos es 
came to be benefited by cross fertilization through insect and 
other external agencies, or again simplified by partial abortions 
* The apparent] nisexual flowers, supposed to have de- 
y exceptional case of unisexual To Ts, tr 
Scended from perfect harsiaphirsdite ones by the gradual a a coed 
sexual elements, in which the abortive element is occasionally again a8 aoe 
an retrogression. An occasional perfect stamen in @ female Buphor® 
Wer cannot be said to be a real return to hermaphroditism. 
Le ea 
