266 



MR. E. M. WELLISCH ON THE MOBILITIES OF THE 



, T7i i Height of fall to 



leni- Electric 



perature. I7t point. 2nd point. 



C. volts/cm. cm. 



Time. 



Pressure. 



k. 



mm. cm./sec. cm. /sec. 



cm. I tee. 



PENTANE. 



14 



13 



14 



19-5 



20-5 



38-7 



19-3 

 38-7 



77-4 

 38-7 

 77-4 



19-3 

 38-7 

 19-3 

 15-5 



54-8 



,. , f , I positive ion 36 cm. /sec. 



Mean values of fc( egative ^ Q . 35 / 



METHYL ACETATE. 



54-8 



55-0 



Ar , c , f positive ion 0-33 cm./sec. 



Mean values of faml * .. n oc 



L negative 36 



0-36 

 0-31 



0-31 

 0-34 



0-38 



0-34 

 0-34 



0-37 



ETHYL FORMATE. 



20-5 



19-3 



38-7 

 19-3 



38-7 

 19-3 



M i {7 f positive ion 0- 30 cm. /sec. 



Mean values of A i * ,. 



u \negative 0-31 



0-32 



0-29 



0-29 

 0-31 



0-32 

 0-32 

 0-31 



0-32 

 0-30 

 0-29 



0-31 



