262 Scientific Intelligence. 
. 
sults above mentioned, were obtained by means of the so-called © 
a simple gas or a mixture of two—Pogg. Ann., cv, 67. ' 
5. Ona new Law of Binocular Vision; by the Rev. J. Drvous, (Pio 
Brit. Assoc., Ath., No. 1615).—The object of the law in questions io 
obviate the imperfect vision which would sometimes arise from the differ 
ence of the pictures in the two eyes. In some cases this difference wel 
if the finger or any other object is held before one eye, the image of 3 
from the one retina is superposed in the sensorium on a@ part of he Hall 
scape formed in the other eye. On mere physical principles, this might 
be expected to blot out or greatly confuse that part 0 ag 
upon which it was placed; but upon trial this is not found to be the 
case, as that part is merely a little dimmer than the rest from being se 
only with one eye, but is equally distinct and as truly colores there 
By various experiments the author had ascertained that this was | 
sult of a peculiar power of the will, by means of which the mind 7 
led, when two different images are superposed in the sensorium, © oblit 
whicheyer it pleases, to bring that object into view, and entirely 1 aa 
e other,—it sees, in fact, whichever it wills to see, 
efforts of the will can easily bring either the one or the sie ae 
The importance of this law, which enables the mind to cle ae 
shall see. When these arrangements are made, it is found ee 
tting it. The effect of the a, the 
«. own 
ggg by enn’ the picture in the imperfect eye, ae sos 
1 SDSS oa ara 
