CYCLOPIILE. 
lt)l 
antennae, he immediately conjectured that the organs re- 
sided in the swellings which mark the antennae of the 
male, and were applied to the vulva, which he correctly 
enough states to be situate in the abdomen.* This mis- 
take, however, Jurine has cleared up, having demonstrated 
the organs in both sexes, and watched the act of copula- 
tion itself. When the mother is about to lay, we may 
perceive the material of the eggs, which I have described 
above under the name of internal ovary, divide into two 
columns, one on each side, and pass through the canalis 
deferens, covered with a fine pellicle, which forms the sac 
in which the eggs are contained when extruded. This 
bag of eggs, or external ovary, remains suspended at the 
tail of the female for several days, varying from two to 
ten, according to temperature of weather, &c.f The eggs 
themselves, during their sojourn there, do not increase in 
size, but undergo various changes in colour, &c., and at 
the proper time the ovary opens, and the young ones are 
ushered forth into life, as unlike the parent as can well be 
imagined. I have already said that Leeuwenhoek has 
noticed this difference between the young and old, and 
upon first observing it, he appears to have been much 
surprised at the unexpected discovery. He repeated his 
experiment, therefore, of separating an insect, with the 
ova attached to the tail, and found the same result : “ Ex 
hisce visis,” he concludes, “ certa mihi persuasi ea ani- 
malcula, quae jam oculis meis observabantur, ex ovis illis 
nata esse. ,r J He watched them for seven or eight days, 
and found them increased in size ; but here, when just on 
the threshold of discovery, he seems to have stopped, and 
he makes no further mention of a continuation of his 
observations. 
De Geer also noticed this curious fact, confirms the 
observations of Leeuwenhoek as far as they went, gives 
* Entomost., pp. 16, 1 7. 
f Leeuwenhoek says they extrude their ova in the space of one day or 
night, and bring them to perfection in the space of three days. — Epist. ad 
Soc. Reg. Ang. 
$ Epist. ad Soc. Reg., p. 139. 
