before the Linnean Society, May, 1878. 249 
, that genetic homology does not exist, mor- 
phological homology is vague and doubtful, position indicates 
rather that of the ovular or seminal than of the carpellary 1n- 
ens so also does the secondary and adaptive homology 
0 i0 
organ in question is not the exact homological representation of 
either the carpellary or the seminal integument; but practically 
it is most useful and instructive to treat it as seminal. And 
as to the name of the two great subclasses of Dicotyledons, as 
all are agreed that they are essentially distinct, in that the one 
is deprived of one of the two envelopes (carpellary and seminal) 
which exist in the other, the received names Gymnosperms 
_ A valuable portion of Strasburger’s essay consists in his de- 
tailed illustration of the development of the flowers of Welwits- 
chia, an important contribution to the completion of that history 
