294 



C. L. Speyers — Solubilities of Some Carbon 



the solvent was other than water, the air was dried by calcium 

 chlorid. 



About half an hour was needed to get the temperature of the 

 water bath constant to 0'1° for ten minutes. When that was 

 done, at the end of the ten minutes, the solution with undis- 

 solved solute was drawn over into B, and through the filter 

 plug into C. When the solute was a nitrogenous body, the 

 solution was analyzed by the Kjehldahl method ; by specific 

 gravity, when the solute was non-nitrogeneous. Evaporation 

 to dryness and weighing the residue was altogether unsuitable, 

 too much decomposition. 



The solutions were believed to be in just the right condition, 

 since the large mass of crystals present when the solution was 

 drawn over must have prevented appreciable supersaturation 

 on the one hand, and on the other, as the temperature was 

 always falling at this time, though only very slightly, the solu- 

 tion must have been completely saturated. 



The thermometer was carefully calibrated. It was divided 

 into tenths and the temperature is probably correct to this 

 quantity, but hardly correct to a smaller quantity on account 

 of the uncertainty of the temperature of the exposed thread. 



The examination and purification of solvents and solutes 

 have already been described.^ 



The following tables give the results calculated to per cent 

 gram-molecules, that is, to the number of gram-molecules of 

 solute in 100 gram-molecules of solution at the accompanying 

 temperature. The usual chemical formulse were used in the 

 calculations. 



Water. 









Chloral 













Ur 



ea. 



Uretbane. 



hyd 



rate. 



Succinimid. 



Acetamid. 



Eeso] 



■cinol. 



0-0° 



1677 



0-0° 3-61 



0-0° 



20-60 



0-0° 



1-58 



0-0° 29-64 



0-0° 



9-78 



11-0° 



20-82 



10-3° 6-09 



11-3° 



30-23 



11-3° 



2-74 



10-6° 34-35 



10-0° 



13-27 



19-8° 



22-69 



11-1° 6-62 



23-7° 



45-86 



20-7° 



4-23 



19-9° 40-72 



34-6° 



23-67 



31-7° 



28-24 



23-5" 43-70 



38-1° 



59-41 



33-3° 



9-91 



32-9° 49-62 



55-8° 



36-74 



51-4° 



36-67 



31-4° 68-91 







69-3° 



27-14 



45-5° 60-14 



79-8° 



50-91 



69-5° 



43-15 



37-0° 75-58 











63-0° 77-10 













Methyl Alcohol 



. 









Urea. 



Urethane 





Acetanilid, 



Naphthalene. 



Acenaphthene. 



0-0° 



7-34 



0-0° 31 



18 



0-0° 



5-38 



0-0° 0-87 



0-0° 



0-39 



10-8° 



8-71 



10-6° 41-70 



11-5° 



7-02 



14-6° 1-68 



12-4° 



0-38 



21-7° 



10-81 



22-5° 58 



-58 



22-8° 



11-12 



31-8° 2-97 



30-7° 



0-73 



40-4° 



15-96 



40-9° 90-00 



33-6° 



13 96 



48-0° 5-83 



46-0° 



1-55 



61-2° 



25-77 







40-2° 



17-05 



59-9° 12-34 



62-3° 



2-46 











47-4° 



23-72 



















60-9° 



35-24 



















63-3° 



33-33 

















* 



This Journal, 1. 



c. 









