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Tab. LXIV.
Fig. 1. The Head of a Carp opened.
- THE Head of a Carp being opened, the Brain seemeth to be composed of five ranks of Protuberancies, and one single one.
- † a a. The First rowe † consists only in two Processes, dressed with an Oval Figure.
- † b b. The Second rank † is made up of four Prominencies, trimmed with an orbicular shape.
- † c c. The Third rowe † of Processes are bigger then the former, and are endued with an Oval Figure, standing obliquely.
- † d. The fourth † is One single Process, dressed with an irregular shape.
- † e e. The fifth rank † is adorned with a kind of Oval, or pointed Processes.
- † f. The single Process † is small, and seated between the last Protuberancies, and is beautified with a Triangu∣lar Figure.
- † g g g g. The Nerves of the Eyes † are double the one Optick, the other Motory, and seem to arise out of the first pair of Processes.
- † h h. † ii. † k k. The Olfactory Nerves † begin in knots, and are carried close for some space, and afterward do part, and near their terminations have two orbicular Prominencies † and are at last branched into many Filaments, running transversely (after the manner of a Scolop-shell) the immediate Organ of Smelling.
Fig. 2. Of the transparent substance, encircling the Brain of a Carp.
- † a a a. The Brain of a Carp is every way above and belowe, and laterally immured with a transparent clammy Liquor, bestudded with an innumerable company of specks †, or minute Globules of a yellowish co∣lour, somewhat resembling the Lytharge of Gold; And here I beg the freedom to speak my conjecture, about the first production of this viscide Matter, whence its Transparency proceedeth, and as such it clearly bespeaketh its Conception and Nativity, as the progeny of the more clammy part of the Semi∣nal Liquor, receptive of Concretions caused by Saline Particles; so that this substance, In solutis principiis in its primitive Nature, being beautified with Transparency, may well retain it, when coagulated into a more solid consistence; and being formerly fluid, as Seminal Liquor hath its constituent part, aranged in such orderly positions, fitted to receive Transparency, by reason it being formerly a fluide Body, du∣ring which time it was easy for the subtle and bright Rays of Light to pass through the regular Pores, and make themselves passages every way, and afterward so to dispose the more minute Particles, when consolidated, to retain the same Pores through which the beams of Light were transmitted, when it had the more loose Nature of a liquid Form, which afterward growing more solid with the same passages of Light, keep the primitive Constitution of a Transparent Body, when metamorphosed into a more solid substance, bespangled with a numerous train of little specks, or Globules (of a yellowish colour, resembling the Lytharge of Gold) produced of the more dense and opaque Particles of the Seminal Liquor, affected with disorderly Pores (not answering those of the transparent substance) which do shut out the beams of Light, transmitted through the more regular passages of the other Transparent Body.
Fig. 3. The upper Region of the Brain of a Carp.
- † a a a a a. † b b. † c c. The upper Region of the Brain of a Carp is here added, by reason I found it (upon Dissection) much dif∣ferent from the former. In this Brain I discovered a great Lusus naturae (as oftentimes in other Fish) which hath numerous Prominencies † sporting themselves in various Suapes, Magnitudes, and irregular Situations, interspersed with Processes, running in pleasant Maeanders †. These different Protuberancies do not answer each other in rank, but seem to be confused, as not seated one against another, as in regu∣lar Brains of Fish, and the Processes are not of the same Figure, which is only found in the first pair of Pro∣cesses † endued with somewhat of an orbicular Figure, and small, if compared with diverse other Protu∣berancies; some are of the same shape, and much greater, but not seated in pairs, opposite to each other, but in confused positions. Other Processes seem to resemble Semi-circles in Figure: And the Posterior prominencies are the greatest; and the most minute are seated for the most part, on the margent of the Brain; so that in sine, this Systeme of various Processes (relating to the Brain of a Carp) doth seem to resemble a bunch of Grapes, of greater and less size, confusedly growing to the stalk.
Fig. 4. Of the lower Region of the Brain of a Carp.
- † a a. † b. The lower Region of the Brain of a Carp, is garnished with eight Processes of several Magnitudes. The First pair † are somewhat small, endued with an Oval Figure, and coated with a Red colour. The Promi∣nencies † (confusedly placed between the first and last pair) are four in number, small in size, and orbicular in Figure.
- † c c. † d. The Posterior pair of Processes are much the greatest, as seated near the Medulla Spinalis, and are hued with a Red colour, and of an Oval Figure. The Medulla Spinalis † parted in the middle by a Fissure.
- For the most part, the Processes besetting the Medulla oblongata both above and below, are Red, and incli∣ning somewhat to a cineritious colour, as being cortical. And there are three Prominencies, which are White, as being chiefly made of a Medullary substance.
Fig 5. The Head of a Rochet opened.
- † a a. † b b. The Brain of a Rochet, consisteth of two pair of Processes, The First pair † are much less in size then the other, and are beautified with an orbicular Figure; The Second pair † of Protuberancies are adorned with an Oval Figure.
- † c c. The last pair of Processes † make the Cerebellum, and are endued with a kind of inverted pyramidal Figure, having their Bases above, and Cones below, toward the Medulla Spinalis.
- † d. The beginning of the Medulla Spinalis † as also its farther progress, is divided into two equal portions, by the interposition of a Fissure.