Mr Charles Beil on the Motion of the Eye, 
looking through them ; that is, making an effort of attention to 
the red light which comes through them. Let him then make 
an effort to close his eye-lids, and that red light will disap- 
pear. And this will be found to be the case, although the eye- 
lids be stretched with the finger so as to prevent all corrugation of 
the skin of the eye-lid. If this experiment be made on the eye of a 
friend, the cornea being visible through the stretched eye-lid, it 
will be seen to ascend upon every renewed effort to close the eye. 
In my former paper I had stated, that, by an affection of the 
nerve of the face, the eye-lid remained open and fixed whilst the 
eye-ball retained its motion. Within these twenty-four hours I 
have had a case communicated to me of this kind. The physician 
at first conceived, that when his patient attempted to close his eyes 
the one eye went down and the other went up ! But when he 
was requested to make more particular observation, he then 
found that when the eye-lids of the sound eye were closed, the 
cornea of the other eye was seen to turn up. Here the eye- 
ball performed its part of the office, but the eye-lids were im- 
moveable. 
Dr Brewster must now be satisfied that I have taken his advice, 
and that I have, with respectful diligence, examined his observa- 
tions. As the utmost forbearance is required from all who carry 
side-arms among peaceable citizens, so ought a journalist, who 
has so great a power of annoyance in his hands, to be reserved and 
temperate above other philosophers; yet Dr Brewster has 
not only written in a temper ill calculated to conciliate, but he 
has hung up an announcement for nearly a year past, qf' the re- 
ffutaiion of cei'tain supposed discoveries of mine, — and although 
this title was of itself an attack and a condemnation, he delayed 
from week to week entering on the subject, and has finally failed 
to do what his advertisement announced. 
Art. XXI. — Remarks on the Illuminating Power of Coal- 
Gas. By Adam Anderson, Esq. E. R. S. E., Rector of the 
Academy, Perth. 
In the short memoir, which I submitted to public attention, 
in the last number of this Journal, with respect to the illumi- 
