IN FLOWERING PLANTS. 201 
from the ring, and the base of this again has become sur- 
rounded by another coat which will form the testa) the ovule 
commenced to turn on its axis. 
At the time of flowering, the ovule will be completely 
curved, so that its foramen will be approached to the hilum ; 
the outer coat is thin ; the inner projects beyond this in a 
cellular loose neck; the nucleus is quite enclosed. Subse- 
quent changes as usual. The embryonary sac I have only 
seen when well developed, at this period it is attached by both 
ends, but I believe its real apex is at the base of the ovulum, 
i.e. it is developed downwards. The testa is thin, no trace of 
à secundine except its apex, which still projects, looking like 
a small fungous mass, no embryo visible. 
The endocarp now becomes osseous, and separates almost 
from the fleshy covering, the embryonary sac commences to be 
filled with albumen, and pushes back the nucleus until this 
is reduced to a thin coat. The embryo is well developed. 
At maturity, the most obvious coat is the nucleary; the 
secundine has gone; the testa except about its base appears 
to adhere to inside of drupe ; the embryonary sac is incorpora- 
ted with the albumen ; no vessels exist. 
1. Ovulum in a very early state. Bud not one line in 
length. 
2. Ditto more advanced, the annulus shewing the ru- 
diment of the second coat to be visible. 
3. Ditto more advanced. 
4. Same in sitü, stigmatic tissue not visible. 
5. Ditto more advanced, half inverted, the greater cel- 
lularity of the apex of the secundine shown, prov- 
ing that it must be formed first ? 
6. Ovule about the same period. 
7. Ditto more advanced. 
8. Ditto more advanced. 
9. Ditto ditto inner coat now nearly enclosed. 
10. Ditto perfectly formed. 
10 a. Same in siti, stigmatic sphacelation, sphacelation 
greater along the base of ciliary processes, (no pollen 
visible or stigmatic.) - 
25 
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