92 



ANNALti A7s'ir YORK ACADEMY OF SCIENCES 



monthly means ending with February, 1905, and the second gives the 

 distribution of the departures of July, 19()4,-June, 1905. 



1905-1906. Tlic iiini. of 1!»05 (Figs. 27 and 44) shows a large pleion 

 in Canada, another on the West Indies and Florida, and an extensive 

 antipleion with I wo centers, one in Texas and tlie other on Xovn Scotia. 

 The conseeutive-niap of F('l)riiai-y, 1!K)5.-Jaimarv, !!»()(; ( l-'ji^-. If)), sliows 

 the two pleions joined together, se|)ai'ating the two anti[)leionian eenlers. 



The following maps show the shifting and final disappearance of the 

 northeastern a.ntipleio(i. hut the southern or southwestern anti])U'ioii I'c- 

 mains, undergoing small changes of position or extent. 



"^^m 



-% 





Fig. 42. — Departures of temperature 

 averages for March, IdO'i, -February, 

 1905 





Iik££ 



% 



Fig. 4."?. — Departures of temperature 

 averages for July, IBOh-June, JtO-l 







'■icSf^r^ 



'k^ 



:rs 



X 







"S^S-^t 



:^m^.-k^ 







z:^'-H.^ 



r 



jU^u ^--^'^ -■ — ^ .-^. . . . . -V y . . — ; — r i .1 



I"iG. 44.- — Departures of ieinpcratiue 

 averages for January-De< ember, n.O.j 



w^^^m^^ 





Fig. 45. — Departures of temperature 

 averages for February, li)Oa,-JaHuary, 

 I'M 



The variation of the departuves is of some interest, 'i'hc highest de- 

 parture in the north is + 1°-1' f<>i" 1905, in the North Dakota district 

 -f 2°.l, for February, 1905,-.7aniiary, 190(), + 2°.3 for Maivh. 1905,- 

 Febniary, 190G, and then decreases to -[-1°-^ ;i"*l afteruanls increases 

 again progressively until November. 1 905,-Oetober, l!>()(i. when it readies 

 -|- 2°. 5. At the center of th(^ antipleion, the negative (h^partures for the 

 first three consecutive nuips are — 1°.4, — l°.l and — 0".8. .\ general 



