APPENDIX A LXIX 



Magnetic Observations 



At Agincourt from March 1917 to March 1918 the mean DecHna- 

 tion for the month increased from 6° 35-6' West to 6° 38-1' West. 

 The mean Horizontal Force decreased from 0- 15960 dyne to 0- 15925 

 dyne. The mean vertical Force decreased from 0-58485 dyne to 

 0-58405 dyne. The mean Total Force decreased from 0-60623 dyne 

 to 0-60537 dyne and the mean Inclination increased from 74° 44-2' 

 to 74° 44-9'. 



At Meanook mean Declination has changed from 27° 45-9' E to 

 27° 45-4' E. 



Magnetic disturbances were of frequent occurrence during the 

 year. During the month of August they were particularly active, the 

 largest ones occurring on the 8th, 9th, 20th, and 21st. The Maximum 

 Range in the different elements occurred on the 9th; at Agincourt in 

 Declination the change of direction was from 5° 26 - 2' W to 8° 48 • 7'W, 

 in Horizontal Force from 0-15427 dyne to 0-16414 dyne and in 

 Vertical Force from 0-57517 dyne to 0-58753 dyne, and at Meanook 

 the change of direction was from 25° 16- 1' E to 28° 59-0' E. 



A large number of storms were of the type having sudden com- 

 mencements where the time of the first movement is practically 

 instantaneous throughout the Globe. 



The Mean Diurnal Range obtained from the hourly measures 

 of the different elements shows a variation throughout the year at 

 Agincourt having a maximum value in Horizontal Force of 97 gammas 

 in August 1917 and a minimum of 33 gammas in February 1918. In 

 Vertical Force a maximum of 51 gammas in August 1917, and a mini- 

 mum of 9 gammas in January 1918, in Declination a maximum of 

 17-1 in August 1917 and a minimum of 7-2' in December 1917, whilst 

 at Meanook it shows in Declination a maximum of 21-5' in July 1917 

 and a minimum of 6-3' in January 1918. 



At Meanook the instrument was remounted on a slate base on 

 August 27th, and since then the base line value has kept fairly con- 

 stant. 



Phenological Observations, 1917 



The following report on the phenological observations of 1917 

 is presented by Mr. F. F. Payne of the Central Office of the 

 Meteorological Service. 



"Throughout Canada vegetation was slow in developing and 

 the flowering of plants was unusually late. This was more especially 

 the condition in British Columbia, Alberta, Ontario and Quebec." 



"Somewhat more interest was shown in the phenological observa- 

 tion of 1917 than in the previous year and the number of reports re- 

 ceived was forty-five. Of these several were from new observers 



