it in different individuals ; and it is the co- densed on the surface into a smooth mem- 
lour of this that produces the colour of the brane, called the membrana hyaloidea. 
eye, in the popular sense of the phrase. This is marked in front by a circular series' 
There is a remarkable correspondence in of black radiated lines, caused by the adhe- 
tlus point between the skin and hair and the sion of the ciliary processes, which, like other 
iris. A light complexion and hair is accom- parts of the choroid, are covered’ with pig- 
panied with blue, grey, or the lighter co- mentum nigrum. Under these a circular 
lours of the iris; while a dark skin and canal runs, named the canal of Petit, 
black hair are attended with the dark brown The crystalline humour or lens is imbed - 
‘led in the front of the vitreous humour. 
In that curious variety of the human Its size is about that of a pea, but it is much 
race, called the Albinos, where the skin and more flattened in form. It is of a waxy 
hair are of a dead milk-white hue, in con- consistence, softer externally, and growing 
sequence of a total absence of the rete gradually firmer towards the centre. The 
mucosum or colouring principle, the co- lens is contained in a capsule, formed by 
louring matter of the iris and choroid is also the membrana hyaloidea, splitting into two 
deficient, and these parts appear red from layers. It has no apparent connection to 
the numerous blood-vessels which they con- this capsule. It is an opaque state of this 
TalD< hrirlv that nntictltiitfto tbr. J 
. °t transparent water, placed immediately 
Under the choroid coat is found a third behind the cornea, and occupying the 
Ptnhrano rvf* thn mm Knlln 1 1 4-1, „ , 4.1 1 . . * “ ® 
membrane of the eye-balls, called the reti- space between that membrane and thecrys- 
na, which is formed by the expansion of the talline lens : it is easily reproduced when let 
Vnn/iiiiloi'ir cmhctonnA of 4-1 . „ i-t _ i 
forms the immediate organ of vision. It is In the midst of the space occupied by 
of a yellowish grey colour, and so extremely this humour the iris is found, and it divides 
soft as almost to be lacerated by the slight- the space into two portions, called the an- 
Oof- f-nimll Tin " l ' 1 . . 1 ' 
\ est touctl - lts 0,,ter surface is entirely un- tenor and posterior chambers of the ey< 
connected with the choroid coat ; and the which communicate by means of the pupi 
inner surface is expanded on the vitreous The anterior is much the largest of these. 
to the vitreous humour. On the inside of thalmic artery. 1 
the retina are seen the branches of an artery The iris is very largely supplied with 
and vein, which enter through the centre of nerves from a small ganglion, named lenti- 
the optic nerve, (artena et vena centralis cular, formed on a branch of the nervus 
derived. The cellular substance is con- The junctions of the eye-lids are called the 
