206 
Anatomical Belations of the 
[Monthly Microscopical 
Journal, Oct. 1, 1869. 
veiling toward the sclerotico-corneal junction. The insertion then 
of all the fibres of the ciliary muscle may be said to be the sheath 
of the muscle at its anterior extremity and the inner lamina of the 
cornea. 
What is the origin of this muscle ? In regard to this, if the 
muscle of this bird examined in the present instance displays the same 
relations as that of the ostrich, I have to correct a mis-statement 
made in my former paper.* The origin of the fibres is not absolutely 
confined to the inside of the sclerotic. Some few of them may be 
traced into the choroid coat. These are a few of the most posterior 
fibres ; and my reason for assuming that they have an origin in the 
choroid is, that when the latter is torn away the fibres are set free, 
and present the usual sharply broken extremities. 
The plan of manipulation I have adopted in making the obser- 
vations which have led to these conclusions is this : — The eye is 
first divided into two parts — from above downwards, and in the 
transverse plane. The posterior half falls away with the vitreous 
and lens, leaving the cornea, part of the sclerotic, the iris, part of 
the choroid, and the remainder of the ciliary processes. With a 
pair of scissors then this hemisphere is cut into halves. Then with 
a Valentin's knife I take a number of extremely delicate sections, at 
right angles to the internal surface of the eye, and in the antero- 
posterior direction. By this means I obtain specimens showing 
cornea, sclerotic, choroid, iris, and ciliary muscle. 
Having placed one of these sections in glycerine, a needle is 
used — not to " tease out," but merely to prevent the falling together 
of the several parts. Under a low power, and with Mr. ColHns' new 
dissecting microscope, this can readily be done. It is then seen 
that the muscle is of the form I have described, and that the cho- 
roid is united to the sclerotic at two points. One of these points — 
the anterior one, on a level with the iris — is, as shown in the draw- 
ing, merely a feeble union, maintained by a few fine fibres of elastic 
connective tissue. The other is a muscular union, is more posterior 
— being, in fact, at the hinder extremity of the ciliary muscle — and 
is formed, so far as I can see, by the passage of a few muscular 
fibres into the soft substance of the choroid. At these two points, 
then, there is connection of the muscle with the choroid. The 
anterior one is merely a loose attachment, and a mere stroke of 
the needle severs it without injuring the muscle or the choroid ; the 
other is more decided, and when it is broken the two or three 
muscular fibres involved in it present broken extremities. 
All through the rest of its course the muscle is distinct ; its 
outer side firmly and inseparably blended with the sclerotic, and 
its inner one bounded by its special sheath. This is nearly all that 
I have got to say as to the position of this muscle. My view may 
* ' Ophthal. Review.' 
