Tue Microscorr. 65 
Stockwell, but even this arrangement would be much inferior 
to the device suggested in my article, as it requires an ad- 
ditional lens to the eye-piece which occupies a part of the valu- 
able space between the eye-piece andthe eye. While spectacle 
glasses properly have to be constructed to fulfil at the same 
time three separate conditions, viz.: 1st, the connection of the 
astigmatic curvature; 2d, the astigmatic axis; 3d, the abnorm- 
ity of the focal length of the eye, my eye-piece requires only 
the cylindrical curvature of the front surface to accomplish the 
same result. In proposing to start by making three different 
eye lenses for selection, I did not mean to say that it is 
unnecessary to have the eye throughly examined for astigma- 
tism by a specialist, and then construct the eye-piece in exact 
conformity with his formula, but, I expect in this simple way 
to approximate the exact curvature near enough to reach a very 
decided improvement of vision. Indeed for the correction of 
any kind of abnormity of the eye, three different lenses can be 
constructed with such proportionate curvature, in geometrical 
progression, that, in most cases, one of the lenses will correct, 
or, least, so greatly reduce the error that a person troubled with 
astigmatism may, from the effect, regard the correction to be 
almost perfect. And even in the most aggravated case, which 
is, when the defect requires a lens laying just midway (in geo- 
metrical progression) between two of the three lenses so that 
their correcting power would be equal; in this case the im- 
provement would yet be very satisfactory, and, indeed, it would 
be very great. I claim that most wearers of spectacles who 
believe in having just the right “ number” of glasses, are, in 
fact, more out of the way than they would be if they had, of the 
three different lenses, in accordance with my idea, the one 
nearest to fitting their eye, and I am not willing to except astig- 
matism from this statement. 
‘NOTE FROM DR. TAYLOR. 
HAVE just received the Ohio State Journal of March 8th. 
It contains a report of the work of the experimental station, 
of Ohio, detailing the investigations of H. E. Weber relating to 
his oleomargarine and butterine experiments. So far as his ex- 
periments relate to butter and to the detection of butter in oleo- 
