175 



PLACE OF OBSERVATION. 



Doncaster..., 

 Harrogate.... 

 Sheffield .... 

 Pocklington , 



Arras 



Selby , 



Hull 



Skipton ..., 



Settle 



Lancaster ..., 

 K. Lonsdale 



Horton , 



Litton 



Gearstones 

 Birkenhead , 

 Calderstone 



Lincoln 



Driffield .... 



Difference 



of 

 calcnlation 



from 

 observation. 



— 14-8 



— 47-3* 

 -11-4 

 -14-8 

 + 1-6 



— 0-7 



— 4-2 



— 4-1 



— 23-4* 



— 2-6 

 + 28-6* 

 + 34-6* 

 + 13-7 

 + 25* 



— 9-1 

 + 30-8* 

 + 5-5 

 + 23-9* 



The asterisks mark the observations which deviate remark- 

 ably from the mean. Two observations, in which the deviations 

 are excessive and due to local causes, are omitted. These are 

 High Force where the intensity is reduced by the proximity of 

 the greenstone, and Penyghent where, perhaps from the great 

 elevation of the mountain (2300 feet), the intensity is much 

 below the average of the district. 



It does not appear practicable, from these observations on 

 Magnetic Intensity, to draw any safe conclusions as to the 

 degree in which it is influenced by the masses of ground in 

 Yorkshire. The observations appear not so surely to be trusted 

 as those of the Inclination — the limits of error of observation — 

 perhaps the influence of vert/ local causes — appear to be great, 

 and to require numerous experiments before the exact results 

 can be obtained. 



