L 377 
XXII. On the Nerve proceeding to the Vesicles at 
Base of the H< 
Iteres, and on 
the Sub-costal Nervure in the Wings of Insects. By J. Braxton Hicks, M.D. 
Zond., F.L.S. 
Read June 20th, 186 1 . 
It 
unnecessary to enter into any description of the vesicles of the halteres and wings 
already fully noticed them in former pages of the Transactions and Journal 
I 
showed first, also, of any observer, that to them a very large nerve proceeds, next in size 
to the optic, and that the divisions of this nerve pass to the base of the vesicles. 
The additional information, which it is my desire now to lay before the Society, is, that 
a bipolar ganglionic cell is to be found just beneath these organs. 
If, instead of viewing the parts intact, the base of the haltere be broken up, it will b( 
found that, shortly before arriving at the position of these vesicles, the nerve enlarges in 
the following manner :— Each fibril is developed into an elongated ganglionic cell, gene- 
rally with a large nucleus (a, figs. 1, 2, 3). 
The distal end becomes contracted ai; 
f^ i 
a 
I 
a- 
F, g L 
a 
F, g 7 
SU 
for 
short space, but finally and gradually dilates, until it comes in contact with the inner 
surface of the vesicle (b, figs. 1, 2, 3) 
In this terminal expansion I have sometimes 
observed 
nucleus (c, fi 
sometimes, however, the 
have been granular 
Aether there be a small ceU at the very extremity, I am unable to say with any certainty, 
°ut comparing it with its homologue in the subcostal nervure, I am inclined to think 
the existence of such a structure doubtful. 
