(35B

[Note in another hand:] pp. 171/2

(35B

Ch VI

but implying a want of balance between the fluids poured out from, & again taken up by, the intra-ocular vessels does not usually cause any lacrymation. When the balance is on the other side, & the eye becomes too soft, there is a greater tendency to lacrymation.

Finally, there are numerous morbid states & structural alterations of the eyes, & even terrible inflammations, which may be attended with little or no secretion of tears.)

(It also deserves notice, as bearing on our present subject, that the eye & adjoining parts are subject to an extraordinary number of other reflex & associated or consensual movements, sensations, & actions, besides those in relation to the lacrymal glands. When a bright light strikes the retina of one eye alone, the pupils iris contracts, but the iris of the other eye which has not been directly acted on moves by the light, moves after an appreciable a measurable interval of time. The iris likewise moves in accommodation to near near or distant vision vision, & when the two eyes are made to converge.*(22) Everyone knows how irresistibly the

(13

[Note in another hand:] Desc. of Man, vol ii, pp. 147/8

(13

Ch Birds

black spots or marks can still be seen distinguished in many of the perfect oculli, as in that (fig ) f drawn,

The contraction & equalisation of the irregular sub-triangular mark marks (b", c",) d", is of the elliptic ornament manifestly from the thickened portion of the ring on the left upper side of the ring ball-and-socket ocellus. The lower part of the ring is, also, always a little above the average in thickness, then the general average greater part of the circumference thickness thickness, & this can clearly be seen to follows from the shape of the lower spot mark spot (b) of the elliptic ornament having become being above originally thicker than the upper one (b'). Every step in the process of change confluence & modification can be followed; & the black ring ri surrounding the ocellus ball of the ocellus is certainly found by the modification & union of two of the black spots in one of the rows, together with a third spot. in [text excised](a) (text) with respect to the shading of [text excised] narrow dark brown, orange

[Note in another hand:] Desc. of Man, p. 150

genera of monkeys: thus in some species of Macacus, the tail is longer than the whole body, consisting there are of twenty-four caudal vertebræ; in others, it is a mere stump & scarcely visible, containing only three or four caudal vertebræ. in these latter monkeys the tail is hardly visible. In some kinds of baboons there are twenty-five, whilst in the mandrill there are only ten very small stunted caudal vertebræ.*(65)

This great diversity in the length of the tail & in the number of the vertebræ & in animals which following nearly the same habits of life, renders it probable that the