138 Serentifie Intelligence. 
SCIENTIFIC IN TELLIGENOCE. 
I. CHEMISTRY AND Puysics. 
1. On the constitution of Naphthalene.—The constitution of the 
hydrocarbon naphthalene has been fixed, from its close analogy 
with benzene, as follows :— 
oan 
HC/\C-~CH=CH 
eas | ihe 
HC\ -C~CH=CH 
CH 
Wrepen has recently proposed two other formulas for this sub- 
stance and has given his reasons for preferring them. These ra- 
tional formulas are both unsymmetrical. The first is the most 
important, and is :— 
€ Symmetrical formula, 6th, the existence of two perchloro- 
naphthalenes, And 7th, the existence of two analogous com- 
pounds, isomeric with styrene and acetenylbenzene, which this 
theory foresees may be synthesized from benzene and ethylene. 
The second formula, isomeric with the first, is:— 
CH 
Ree ae 
HC\ 7 “baba 
CH 
It differs from the s trical £ ; ae rae 
bination of the ahioh ai oma ormula only in the mo 
also to 1t.— Ber, Berl. Chem. 
