104 ANNALS NKW YORK ACADEMY OF SCIENCES 



The picions pendulate and surge at the same time. An old pleion may 

 be reintensified. In the case of the pleions B and C the surging is noth- 

 ing but the superposition of a new pleion upon an old one, so that C is 

 the residual of B, plus a new impulse produced in situ under the iniluence 

 of the direct solar action. In this way, it is conceivable why the pleionian 

 variations may be more important on the North x\merican continent tlian 

 the identical variations in tropical regions. • 



About Temperature Variations and thk Changes of tiik Arctic 



Ice Conditions 



In order to connect the European annual departure maps with those 

 of the North American continent, I utilized the results of the observa- 

 tions made at St. Johns, N. F., Upernivik, Jacobshavn and Ivigtut, on 

 the west coast, and Angmagsalilc, on the east coast of Greenland, those 

 of the Icelandic stations Stykkisholm, Vestmanno, Grimsey and Boruf jord 

 and, finally, the observations made in Thorshavn of the Faroe Islands. 

 For information about the variations which occurred on I he Atlantic 

 Ocean, I took the results of the observations made in San Juan (Porto 

 Eico), Hamilton (Bennuda), Angra do Heroismo and Ponta Delgada 

 (Azores), Funchal (Madeira), St. Vincente de Cabo Verde and. finally, 

 those of St. Helena. 



The St. Helena observations were extracted from a report of ,L S. 

 Dines.^** The portuguese data were kindly sent to me by the Director of 

 the Observatory of Lisboa, in manuscript for the years 1906-1909 and in 

 printed form for the previous years.^® The data for Bermuda were copied 

 from the "Monthly Weather Eeview" and the reports of the Meteoro- 

 logical Service of Canada. Those for Porto Eico were sent to me by 

 Section Director Oliver L. Fassig. The results of the observations made 

 at Danish stations were sent to me by the Director of the Meteorological 

 Institute of Copenhagen.^'' Finally, the data for Newfoundland were 

 copied from the Canadian Eeports. Unfortunately, for the period of 

 years taken into consideration, only the records of St. Johns are complete. 



It would have been very desirable to have some records for Labrador 

 and the Hudson Bay region, to obtain a closer connection between Green- 

 land and Canada, but the distances between Ivigtut and St. Johns, Father 

 Point and Quebec are so much smaller than the ordinary pleionian dimen- 



2« John Someus Dine.s : CUmatological table.s for St. Helena, with a report on . . . 

 (Meteor. Office Publ. No. 20."? : The trade winds of the Atlantic Ocean, London. 1010.) 



™ Anaes do Observatorio do Infanta d. IjuIs. Obsarvacoes dos postos nieteorologicos. 



** Meteorologisk Aarbog . . Anden del : Faeroerne, Island, Gronland og St. Croix. 



Udgivet af det danske meteorologlske Institut. 



