XXXVI PREFACE. 
nearly name, sac of the embryo, which is excellent in 
every respect. lam not acquainted with M. Mirbels' 
quartine; and I think it will be found that it is the 
~ embryonary sac, as well as his quintine. 
It follows that the liquor amnios is never enclosed 
"hin the nucleus, it always exists in the early periods of 
Nhe development of the sac of the embryo, and is cer- 
Anly either the rudiments of albumen, or in exalbu- 
1. Produetion of the midrib beyond the terminal 
sinus analogus to a mucronate leaf, it is evident 
that this may be carried to such an extent as to 
reduce the stigmatic surfaces to a mere point at 
the apparent base of the style. 
2. Production of the stigmatic base beyond terminal 
p siias forming a bilobed stigma, the branches of 
this must be on the same place. 
3. Obliteration of the terminal sinus, constituting 
an uniform stigma. 
4. Obliteration of the inferior sinus. 
I am not aware of any instance in which the stigma 
of a simple carpellary leaf is capitate, one sinus is 
always existing. There is however, on the principle, 
that both sinuses may be confluent, no theoretical 
