Relation to Preastm and Temperature. 



491 



19. Teluidine para. — Tables 10 and 11 contain data for 

 para toluidine. A feature of these results is the circumtlexure 

 of the isopiestics in the andercooled part of their course. 

 This is probably not an error, since it recurs under similar con- 

 ditions in ease of thymol, §23. If contraction due to cooling 

 were to continue at the rate shown in table L2, there would be 

 110 volume change at 1400 atm. To solidify the undercooled 

 liquid, as much as 500 atm. were necessary. 



Table 10. 



Compressibility of Para-Toluidine, C 7 H 7 NH 2 , referred to 20 atm. 



Boiling point, 198°; melting point, 43°. 





V 



Observed. 



/3xl0 6 



Computed 



V 



r xl0' 

 00 



Diff. x 10* 



#xl0 6 



| 



e, l 





V 



i? o xl0 6 







r xl °* 



F X103 











• 28 ° 



20 



00 



o-o 





±-o 







14-]4 cm 



100 



43 



4-6 



56 



46 



-*1 



59 



60 





200 



10-0 



10-0 



56 



10-2 



-•2 









300 



15-8 



15 6 



56 



15-5 



+ '2 









400 



206 

 00 



20-9 



o-o 



55 



20-5 

 00 



+ '2 







65° 



20 



±-o 







1473 tm 



100 



5-5 



5-5 



69 



5-3 



+ •2 



68 



69 





200 



11-6 



11-9 



65 



11-7 



±-o 









300 



n-4 



17-4 



62 



17-7 



-•3 









400 



23-5 



23-5 



o-o 



62 



23-4 



+ 'l 







100° 



20 



o-o 



^ _ 



o-o 







87 



88 



15-02 cm 



100 



63 



6-3 



79 



68 



-•5 









200 



14-5 



14-5 



81 



14-7 



-•2 









300 



22-2 



22'3 



79 



21-1 



+ •1 









400 

 20 



29-0 



29-3 



77 



28-8 



+ •4 









o-o 



o-o 







o-o 



•o 







16-36 em 



100 



11-0 



10-9 



137 



10-6 



+ •4 



138 



142 





200 



22-8 



22-8 



127 



22-5 



+ •3 









300 



334 



33-4 



119 



33-1 



+ •3 









400 



42 4 



42-2 



112 



43-1 



-•8 







310 



20 



00 



o-o 











o- 



392 



422 



1905 cm 



100 



29-0 



294 



365 



276 



+ 2- 









200 



561 



? 52-0 



300 



545 



+ 2- 









300 



762 



75-7 



271 



763 



-o- 









400 



92-7 925 



243 



945 



-2- 







Table 11. 



Thermal expansion of Para-Toluidine. 



y x 10 3 , referred to 28°. 





Atm.= 





20 



100 



200 



300 



400 



H = 



28° 

























65 



42 



41 



40 



39 



38 





ion 



63 



60 



57 



56 



53 





185 



158 



149 



142 



136 



131 



310 



348 



313 



287 



265 



247 



* Liquid under-cooled. Solidifies at 500 atm. 



Am. Jour. Sci— Third Series, Vol. XXXIX, No. 234.— June, 1890 

 32 



