74 Improvement in the Manufacture of Paper. 
cially by Mr. Hume, which will be found in various eleménfary 
and periodical works of science, particularly in the Philosophical 
Magazine, and the London Medical and Physical Journal. To 
these we earnestly recommend the attention of our readers, par- 
ticularly those of the Faculty of Medicine in all its branches, on 
whom the verdict of an English Jury, and consequent life or 
death of a fellow-creature, often solely depends for its direction, 
x 
IMPROVEMENT IN THE MANUFACTURE OF PAPER. 
[From the New York Evening Post.) 
We have lately visited the paper mills of Thomas Gilpin and 
Co. on the Brandywine, and witnessed the performance of their 
new machine for manufacturing paper on an extensive scale, 
which promises an important addition to the arts and manufac~ 
tures of our country. This process of making paper delivers a 
sheet of greater breadth than any made in America, and of any 
length—in one continued unbroken succession, of fine or 
coarse materials, regulated at pleasure to a greater or lesser 
thickness.—The paper, when made, is collected from the ma- 
chine on reels, in succession as they are filled ; and these are re- 
moved to the further progress of the manufacture. The paper in 
its texture is perfectly smooth and even, and is not excelled by 
any made by hand in the usual manner of workmanship—as it 
possesses all the beauty, regularity and strength of what is called 
well closed and well shut sheets. The mills and engines now 
prepared, are calculated to do the daily work of ten paper vats, 
and will employ a water power equal to about 12 or 15 pair of 
millstones of the usual size. 
The apparatus and the machine are on a principle and con 
struction entirely new, and are patented by the inventors here. 
It has been very expensive, and has been brought to its present 
state of perfection with much labour and perseverance, ; 
NEWLY DISCOVERED MEMBRANE IN THE EYE. 
Doctor Jacob, demonstrator of anatomy in the university of 
Dublin, has discovered, and demonstrated in his lectures on 
the diseases of the eye, a membrane covering the external sur~ 
face of the retina in man and other animals. Its extreme de~ 
licaey accounts for its not having been hitherto noticed. He 
arrived at the discovery by means of anew method of dis- 
playing and examining the minute structure of this and other 
delicate parts. He argues from analogy, the necessity of the 
existence of such a! membrane, as parts so different in structure 
and functions as the retina and choroid coat, must otherwise he 
in 
