MR. WATSON SMITH ON ISODINAPHTHYL. 



23 



roughly purified substance imparts no longer any fluor- 

 escence to solvents. 



Action of Solvents, in the Order of Solubility, 



Lossen's 



dinaphthyl : 



solubility &c. 



The reverse ; ~j 

 more soluble I 

 in ether than j 

 in alcohol. J 



From alcohol 

 separates in 

 moss-like clus- 

 ters. 



In octahedra 

 from ether- 

 alcohol mix- 

 ture. 



Isodinaphthyl. 



Solvents. 



irit. i 



Proof spirit 



Ether. 



Abs. alcohol. 



Methylated spirit. 



About the 

 same as in 

 alcohol. 



Easily soluble, -j 



Melting-point 



= 154° C. 

 Boiling-point = 



above 350° C. 



{ 



Wood spirit. 



Light petroleum- 

 spirit, sp.gr. - 710 



Light shale-spirit, 

 sp. gr. ='737. 



Carbon tetra- 

 chloride. 



Benzol. 



Carbonic disul- 

 phide. 



Oil of turpentine. 



Melting-point 



=204° C. 

 Boiling-point 



= much above 



360° C. 



States of Solubility . Crystalline form 



Scarcely at all, 

 even on boiling 

 with excess. 

 Only very slightly, 

 Soluble on boiling. 



More so. 



Still more soluble 

 than in the above. 



Rather more than 

 in petr. spirit. 



Slightly less solu- 

 ble than in ben- 

 zol. 



Sparingly in the 

 cold, pretty freely 

 in the hot fluid. 



Easily soluble, 

 even in the cold. 



Very easily solu- 

 ble. 



On cooling, a few 

 small plates sepa- 

 rate out. 



/'Beautiful rhom- 

 boidal plates, 

 which, on dry- 

 ing carefully, 

 overlap and la- 

 minate, and 

 have a beauti- 

 ful silky ap- 

 pearance. They 

 possess a very 

 faint, delicate 

 ^ greenish colour. 



Rhomboidal 

 plates. 



► Ditto. 



) 



f Delicate white 

 lance-shaped 

 crystals, in 



(_ clusters. 



The fusing-point is from 200° to 204 C, and the boiling- 

 point considerably over 360 C._, certainly higher than that 

 of anthracene. The subliming-point of this body lies con- 

 siderably below its boiling-point, like that of anthracene. 

 A portion of the pure substance was treated with two 



