Astronomy. 157 
studied and exposed at the student’s leisure. After such ie area 
tion is completed the skin should be put back in its place and fas- 
— together with pins. It is then to be immersed in solaris 
eo) consisting 0 
ed parts pure glycerine, 20 of they 4 of arsenate soda, and 
2 of carbolic ac 
and left in this solution 5-30 days Less to the size of the 
specimen. When taken out it is ready to expose to the air indefi- 
nitely. The skin may turn a little brown after some time in the 
atmosphere, but this may be remedied by covering it for a few 
hours with a cloth which has been moistened with a * sonoortraese 
solution of corrosive sublimate in water. 
The author says further that though a rather long process, it is 
recommended by the beauty and durability of the preparation. 
He has 
Keai will tend to seaming 
IIL Astronomy. 
1. Diameters of the Planets.—We give the following values of 
the apparent diameters ot the planets reduced to the mean distance 
of the earth from the sun and of their true diameters in English 
miles, as being a as emote as any that can be assigned 
from existing data. They a unded in every case upon the 
measures whic foin petite circumstances appear to de- 
serve the greatest weight, and in the reduction to true values the 
solar parallax is taken 87-8 75, and C — s diameter of the earth’s 
ane is —— It would of course be idle to attempt to offer 
final num or where the difficulties indie observations and 
e een the results of the most experienced and 
fovriratily-chsbeuiaketner? observers are so considerable. 
les. 
qe ey 2,850 
a Le a peceus a. ce »550 
J se M cane 
upiter, ong s el ri +200 1 
og 82.500 ; Compression =e 
Saturn, an mage - 74,500 oa 1 
«" Polar.....148°50 66,300 t ee —.. 
‘Draia 52 oe: 68°57 30,600 
Nephine 202-2. 67°26 . 30,050 
In fixing upon the apparent diameters of the bright planets it has 
been desired to adopt values which shall represent the actual are 
