Intelligence and Miscellanies. 365 
gles. The horizon of the pole being the equator itself, it is 
a circle coinciding with that which represents the equator. 
The horizon of the parallel of 45 degrees, being oblique to 
the plane of projection, would be projected into an ellipse, 
which would come nearer to a circle as the place to which 
it belonged approached the pole, and nearer to a straight 
line as the place approached the equator. The inventor has 
adopted a very ingenious contrivance to represent truly all 
these different positions of the horizon. The method how- 
ever, cannot be rendered very intelligible without the aid of 
a drawing, or without reference to the instrument itself. It 
consists, substantially, of a small brass wire, coincident with 
the equator when the horizon of the pole is represented, but 
moveable southward for any other place, at the same time 
being made by compression to assume an elliptical figure, 
and thus including, in every situation, the part of the heavens 
which is visible at each place respectively. We cordially re- 
commend this little instrument to the attention of preceptors 
of academies, who are not already furnished with a celestial 
globe, and especially to private learners, who wi find in it a 
most useful guide and auxiliary ; and it is with the view of 
rendering its construction and principles intelligible to such 
of our readers as may procure it for their own use, that we 
have been thus particular in our description of it.— 
6. Of the precipitation of morphia from laudanum by am- 
a spontaneous deposition of narcotin; by R. 
Hare, M.D. Professor of Chemistry in the University of 
acetic acid, again precipitated by ammonia, and afterwar 
collected and dried upon a filter, the morphia will be obtain- 
ed nearly white, and may be rendered perfectly so, by repeat- 
ing the solution by acetic acid, and precipitation by ammo- 
nia. I have by these means obtained thirty grams of mor- 
phia from an ounce of opium. 
Instead of alcohol impregnated with ammoniacal gas, a 
mixture in equal parts of strong aqua ammonia and common 
alcoho! will answer. ~~ i 
Narcotin is I find sometimes spontaneously precipitated in 
a crystalline form from a solution of opium in proof spirit. 
