Moreover, there is one circumstance in which the orang's and chimpanzee's brains resemble man's, but in which they differ from the lower apes, and that is the presence of two corpora candicantia the Cynomorpha having but one.
There is a life elemental rather than human in those mighty limbs; and the passion that twists them on the marriage-bed has in it the stress of storms, the rampings and roarings of leopards at play. Take this single line: et Venus in silvis jungebat corpora amantum. What a picture of primeval breadth and vastness!
The auditory nerve proceeds first to the lowest or hindermost portion of the brain, known as the bulb, or medulla oblongata; thence a continuation of the nerve tract passes forward to a central region, the posterior corpora quadrigemina, then, by a new relay of nerve-fibres, to the highest and most important part of the brain, that most closely associated with consciousness, the cortex of the temporal lobe, where there is situated the most important of all the centres of hearing.
The formation of the corpora cavernosa, which cause the stiffness of the phallus and its capability of penetrating the vagina, by certain special structures of their spongy vascular spaces, also shows a good deal of variety within the vertebrate stem.
Honestius, inquis, hoc te impensæ, quam in Corinthia pictasque tabulas effuderint. Vitiosum est ubique, quod nimium est. Quid habes, cur ignoscas homini armaria citro atque ebore captanti, corpora conquirenti aut ignotorum auctorum aut improbatorum, et inter tot millia librorum oscitanti, cui voluminum suorum frontes maxime placent titulique?
Fraenkel found that removal of both ovaries in rabbits between the first and sixth days after fertilisation prevented pregnancy, and that the same result followed if the corpora lutea were merely destroyed in situ by galvano-cautery. Either process carried out between the eighth and twentieth days of pregnancy causes abortion.
Somewhat similar processes take place in the ovaries of Teleostean fishes, as I know from my own observations, but no corpora lutea are formed in these, although the degenerating follicles in course of absorption correspond to corpora lutea. Journ. Mic. It then remains without much change till parturition, after which it shrinks and is absorbed.
Indeed, human wretches in the shape of body-snatchers seem here in England to have usurped the office of the owl in our churchyards; "et vendunt tumulis corpora rapta suis." Up to the year 1813, the barn owl had a sad time of it at Walton Hall. Its supposed mournful notes alarmed the aged housekeeper.
My first impulse when I returned home was to rush to the house of my benefactor, the only man who had in my distress interested himself in my behalf. He was a snuff-taker, and it had been the pride of my heart to save the IPSA CORPORA of the first score of guineas I could hoard, and to have them converted into as tasteful a snuff-box as Rundell and Bridge could devise.
Before considering further the question of the corpora lutea as organs of internal secretion, we may briefly refer to the origin and structure of these bodies and of other parts of the mammalian ovary.