162 DEVELOPMENT OF THE OVULUM 
Gossypium. 
The changes that take place are the —— — as will 
be seen from the accompanying sketches Pl. I have 
not been able to trace the actual development e eis coats. 
The uppermost ovules are developed first, at least so far as 
the changes consequent on fecundation are concerned. 
The development of the hairs of the testa commences 
a little before the time of expansion, and consists of a simple 
elongation of the cells of its surface. 
In the early stages of the flower, the ovaria are completely 
enclosed by the tubus stamineus, and the anthers are attach- 
ed to this by means of short stalks. It would appear hence, 
that owing to the very early period being incompatible with - 
such a high degree of union, that the tubus is nothing but 
an elevated torus, and not due to the union of the fila- 
ments. 
When the capsule is 33 lines long, the nucleus presents an 
inner cavity, which has that smooth shining aspect, which 
l believe arises from its being lined by the embryonary sac, 
although the existence of this, from its extreme tenuity is 
very difficultly demonstrable. The cuticle of the nucleus at 
this period is almost separable by dissection. 
Some time after the expansion, and when the ovary is 41 to 
5 lines long, careful examination will detect tubes of great 
tenuity passing down the placenta, and one passes into each 
ovulum through its foramen. The styles have fallen off, 
their bases only persisting ; the canal is filled with an opaque 
grumous mass, which I consider to result from the mass of 
boyaux : 
The irregular appearance presented by the tubes at the 
apex of the nucleus, is due no doubt to the resistance they 
meet to their entrance. 
At the same time the nucleus will be found to present 
a tube projecting from its apex, similar in every respect to 
the tube forming the boyau. This adheres very firmly. 
Examined without pressure, it appears to be applied firmly 
to the apex of the nucleus, and as it were, flattened out. 
Pressure, however, demonstrates beyond a doubt that it does 
