262 Correspondence of J. Nickles. 
nity was thereby afforded me to examine the structural differen- 
ces between the true ovaries and their quast representatives—the 
bud-like processes. ‘The true ovaries had their usual, well-known 
structure—multilocular tubes containing nucleated cells which 
are probably the undeveloped germs; the bud-like processes, on 
the other hand, consisted of a row of cell-masses, oval and con- 
nected by a kind of peduncle, as described in detail in the prece- 
ding paper. ‘These wide differences have, more than ever, per- 
suaded me of the morphological dissimilarity of these two kinds 
of reproducing parts in this animal. It seems to me then that 
the real intrinsic difference between an ovum and a bud lies as 
deep as the conditions of sex itself, notwithstanding the latter of- 
ten has, as in the present case for instance, some of the morpho- 
logical characteristics of the former. 3 
The appearance of sexless, gemmiparous individuals in the ter- 
minal brood would seem to indicate, moreover, that the conditions 
which determine the appearance of individuals usually exclusive- 
y male and female, are not, perhaps, referable to the fact of this 
being the last brood, but rather to relations of warmth and nuttl- 
physiology, and these very animals will, perhaps, subserve th 
successful study of the primary morphological conditions of sex, 
‘ART. XXXI.— Correspondence of M. Jerome Nicklés, dated Paris, 
_ December 30, 1853. 
eal class comprises five sections, as follows: Geomelry, Mechant 
bt Geography and Navigation, and finally, General Phystt® 
' The class of the Physical Sciences contains six sections, namell 
0 - 
Chemistry, Mineralogy, Botany, Rural Economy, Anatomy and. Z ‘ 
ogy, and Medicine and Surgery. The President of the Ac demy 8 
