Constants of certain Organic Bodies at Low Temperatures. 361 



sensible conductivity begins. There is no difficulty, however, in 

 carrying out the measurement in the case of carbon bisulphide, 

 castor oil, or olive oil, over the whole range from —200° up to +15°. 

 At the liquid air temperature all the organic bodies in the; following- 

 tables are, however, practically perfect insulators. 



The following tables give the figures of observation : — 



I. Methyl Alcohol (CH 4 0). 



Corrected galvanometer deflection when the condenser had air as 

 dielectric = 3*96 cm. for 100 volts. 





Mean galvano- 







Temperature in 



meter deflection 



Dielectric 





platinum degrees. 



in cm. 



constant. 



Observations. 



-203-4 



132 



313 



Condenser charged 



-200-8 



13-5 



323 



to 102 volts. 



-188-0 



14-2 



341 





-175-4 



15-4 



371 





-161-9 



19-75 



4-85 





-151-0 



371 



5-05 



Condenser charged 



-143-0 



375 



5-10 



to 18-3 volts. 



-134-0 



3-78 



4-98 





II. Amyl Alcohol (C 5 H 12 0). 



Corrected galvanometer deflection when the condenser had air as 

 dielectric = 4*24 cm. for 100 volts. 



Temperature in 

 platinum degrees. 



Mean galvano- 

 meter deflection 

 in cm. 



Dielectric 

 constant. 



-204-0 



10-4 



2-40 



-201-8 



1-89 



2-14 



-183-0 



1-93 



2-19 



-171-5 



2-05 



2-50 



-150-2 



4-30 



5-28 



-146-2 



9-00 



11-3 



-141-4 



19-50 



24-7 



-138-8 



2-10 



34-4 



-133-3 



2-61 



43-0 



-127-7 



2-55 



42-0 



-1238 



2-50 



41-0 



Observations. 

 Condenser charged to 



98-2 volts. 

 Condenser charged to 



18-6 volts. 



Condenser charged to 

 1-43 volts. 



