26 MR. WATSON SMITH ON ISODINAPHTHYL. 



could be obtained by the action of a high temperature 

 upon benzol, identical with that obtained by Fittig from 

 brombenzol, the analogy does not appear to hold good 

 with dinaphthyl formed from naphthalin. 



2ndly. That a substance having a higher melting-point, 

 and differing in many respects from Lossen's dinaphthyl, 

 is formed. 



3dly. That this body is the chief product of the action 

 of heat upon naphthalin, whether a low temperature, just 

 sufficient to induce decomposition, or a temperature close 

 upon a white heat be employed. 



Finally. Observing the percentage composition of this 

 body, and the volume of hydrogen approximately found to 

 be evolved in the decomposition, also that the boiling- 

 points of dinaphthyl and this body are by no means very 

 widely different, possibly not far apart, I propose to regard 

 it as an isomer of dinaphthyl, and to name it accordingly 

 isodinaphthyl, 



C IO H 7 1 _ 

 C IO H 7 J ' 



If naphthalin be graphically represented as 



Dr. Lossen^s dinaphthyl would appear to be 



CH CH CH CH 



\ / \ / 



CH CH CH C « Dinaphthyl. 



CH CH CH C 



\ / \ / 



>< X 



/ \ / \ 



CH CH CH CH 



Melting-point=i54° C. 



