41S Scientijic Intelligence. 
4. Form ^ the Cornea and Crystalline Lens in the eyes 
of Oxen., <^c , — A very interesting series of experiments has late- 
ly been made by M. Chossat of Geneva, on the curvature of the 
refracting media of the eyes of oxen. His measurements were 
taken from the magnified images of the parts formed upon 
ground glass by a Megascope, and by this means he obtained the 
following results : 
1. 'The cornea of the ox is a segment of an ellipsoid of revolu- 
tion round the greater axis of the ellipse, which represents the 
horizontal section of the cornea. 
2. This axis is always inclined towards the nose, and forms 
with the apparent axis an angle of 9° or 10° in oxen from se- 
ven to nine years old. 
3. The faces of the crystalline lens are segments of an ellipsoid 
of revolution round the smaller axis of the generating ellipse. 
4. The true axis of each face is always inclined without, and 
the two axes form with each other an angle of about 5° in oxen 
from seven to nine years old. 
5. In the elephant the cornea is hyperbolical. 
Our countryman Dr Thomas Young, had long ago remarked, 
that the curvature of the crystalline lens was sometimes, and per- 
haps always, either hyperbolical or elliptical. 
MAGNETISM. 
5. Variation and inclination of the Needle at Copenhagen . — 
The following measures of the variation and dip of the needle 
have been published by M. Wleugel, who has been occupied 
for many years with magnetical inquiries. 
Variation of the Needle at Copenhagen. 
1649, O'i East. 
About 1656, it must have been 0 0 
167S, 3 35 West. 
1806, 18 9.5 
1817, Sept. 8. 17 56 
The inclination of the needle as recently determined is 17° 96'. 
During the interval from 1806 to 1817, the variation on the 
whole diminished, but with frequent alternations. It has been 
observed, that the western deviation is greatest in the month of 
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