Carbon Compounds in Concentrated Solutions. 221 



acetic acid* and this would account for the low molecular 

 weight. This decomposition takes place the more rapidly the 

 higher the temperature, and we find a considerably lower 

 molecular weight at 44° than at 31°. Neither formula can be 

 preferred. 



Naphthalene in methyl alcohol. 7 per cent to 16 per cent 

 naphthalene. These low molecular weights are probably due 

 to some unknown source of error, perhaps to the volatility of 

 naphthalene in methyl alcohol vapor, f It should be noticed 

 that the corrections are very large, emphasizing the statement 

 that this method is only good for high molecular concentra- 

 tions. Boiling point determinations show normal molecular 

 weights for naphthalene in methyl alcohol^ at 43'5°. Neither 

 formula can be preferred. 



Acetanilid in ethyl alcohol. 21 per cent to 31 per cent 

 acetanilid. The molecular weights seem to be normal ; no 

 sign of decomposition. Neither formula can be preferred. 



Acenaphthene in ethyl alcohol. 3\5 per cent to 7 per cent 

 acenaphthene. The solutions are too dilute. Corrections are 

 too large. Neither formula can be preferred. 



Naphthalene in ethyl alcohol. 8 per cent to 19 per cent 

 naphthalene. The molecular weights indicate a normal value 

 but the corrections are too large for a satisfactory conclusion 

 to be drawn. Naphthalene is not so volatile with ethyl alco- 

 hol vapor as it is with methyl alcohol vapor.§ Neither formula 

 can be preferred. 



Urea in ethyl alcohol. 5 per cent to 7 per cent urea. The 

 solutions are too dilute. Indications are normal molecular 

 weights at 27'0° and decomposition at 43'7°. Neither formula 

 can be preferred. 



Benzamid in ethyl alcohol. 16 per cent to 23 per cent 

 benzamid. The molecular weight is probably normal at 27°. 

 Decomposition is indicated at 42°. Neither formula is to be 

 preferred. 



Resorcinol in ethyl alcohol. 50 per cent to 56 per cent 

 resorcinol. The corrections here are very small and yet the 

 molecular weight is about one-third the normal. This would 

 indicate a chemical combination of resorcinol and ethyl alcohol, 

 in agreement with what was noticed when resorcinol was dis- 

 solved in an excess of ethyl alcohol. || Out of thirty -nine solu- 

 tions including all those considered in the present paper, the 

 only one which evolved heat when made was this one com- 

 posed of resorcinol and ethyl alcohol. Neither formula to be 

 preferred. 



* Menschutkin, Ber. d. d. chem. Gesellsch., xv, 1516, 1882. 



\ Talmadge, Journ. Phys. Chem., i, 547, 1897. 



X Journ. Phys. Chein. i, 775, 1897. 



S Talmadge, Journ. Phys. Chem., i, 547, 1897. 



jj Journ. Am. Chem. Soc, xviii. 146, 1895. This Journal, x, 449, 1900. 



