B. V. Marsh on the Distinguishing Features of Comeis. 89 
This is effected as follows. After the chlorhydrate of the ethyl 
base has been evaporated as far as possible without crystalliza 
ed. 
In the final distillation of the chlorhydrate with caustic alkali, 
if there remains any trace of picric acid, an infinitesimal quantity 
is apt to be witeiiod: over, imparting a yellow tinge to the distil« 
late. This may be prevented by adding before distillation a 
very small quantity of animal charcoal. 
Arr. XIl—The Distinguishing Features of Comets considered as 
Phases of an Electrical Discharge resulting from Eacentricity of 
Orbit; by Buns. V. Marsu. 
Variety of material to be found in the solar system should all 
agree in any peculiarity of composition not to be found in any 
One of the planets, In viewing the whole solar system the com- 
tary condition appears to be the rule and the planetary the eae 
ton—indicating that all the members of the system are capable 
Au. Jour. Sc1.—Szcoxp Serres, Vor. XXXIII, No. 97.—JAn., 1862. 
¥ 12 
