174 NOTES ON METEOROLOGICAL OBSERVATIONS AT PLYMOUTH. 



The correction for daily range in the above means for Plymoutli 

 is small, that derived from the Falmouth observations amounting to 

 + 0-003 inch during the month of June. I hope to determine its 

 amount accurately by a full discussion of Dr. Merrifield's observa- 

 tions, supplemented by the readings of a Kichard barograph now- 

 recording in the Laboratory. 



Temperature. 



The mean temperatures given below are calculated from the 

 rea.dings of maximum and minimum self-registering thermometers 

 by the formula T. =Min. +K (Max.-Min.), where K has the follow- 

 ing values : 



K. K. 



1 0-476 

 'J 



January Ip.ggQ 



December J 



February 



November 



March 



October 



}0 



500 



485 



April 



September 



May 



August 



June 



July 



j 0-470 

 }0 



465 



(See title-page of Weekly Weather Report^ 1884, Meteorological 

 Office.) 



Mean for Twenty-six Years, 1865 — 1890. 



Taking the fifteen years 1870 — 1884 for Plymouth, we may compare 

 with the same period for Exeter, Babbacombe, Prawle Point, 

 Dartmoor (Princetown ?), and Bude as give in '^Challenger" 

 Report before quoted, reducing each to sea level by means of the 

 correction 1° F. for 270 feet. 



