64 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 70 



longitude fields between the Channel and New York. The results 

 are given in table 2-W and shown graphically in the curve W, 

 figure 48. 



We have also assembled the values for both decade groups 

 and obtained thereby yearly mean values of the temperature 

 anomalies from all of our decades. This is also given in table 2-W 

 and in the heavy curve of figure 48. 



The corresponding average values for the first decade groups for 

 the twelve southerly 10° fields are given in table 3-W, and in figure 

 29, curve III. The agreement between these different curves is 

 excellent. If we take the mean of the values of the twelve southerly 

 fields (see fig. 24, curve III) for the first decade and combine with 

 it those for the three most easterly 10° fields, that is, between 10° 

 and 40° west longitude (shown in figure 24, curve II of the northern 

 region, Channel to New York), we obtain values which give the 

 anomalies of the average temperature of this part of the ocean 

 eastward of 40° west longitude in the first decade group. Again, 

 if we take the mean values for each year between these results 

 and the mean values for the three most westerly 10° longitude 

 fields, that is, between 40° and 70° west longitude (shown in fig. 29, 

 curve IV), we obtain thereby the average anomalies for this whole 

 region of the Atlantic Ocean in its entire breadth. The values 

 found in this way for the first decade group are given in the follow- 

 ing table and graphically in the curve V in figure 29. 



ANOMALIES OF MEAN TEMPERATURES * 



1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 



10—39° W } 0.2 —0.4 —0.1 0.1 —0.0 —0.4 —1.2 0.2 —0.1 0.5 0.7 0.3 —0.1 



Northern Route i 



fo— ^g° W. / 



„ •'^o XT ■ 0.2 —0.3 0.2 0.2 —0.1 —0.1 —0.7 0.1 —0.1 0.2 0.1 —0.1 0.3 



37—44 '»• ) . 



Mean: 0.2 — 0.3 o.i o.i — o.i —0.2 — i.o 0.2 — o.i 0.4 0.4 0.1 o.i 



40 — 69° W. I O.I -1.2 0.2 — O.I —0.2 —0 8 —I.I —0.4 1.0 0.4 0.5 —0.2 0.6 



Northern Route ( — — 



Meanofthetwolastlineso.2 —0.8 0.1 0.0 —0.1 —0.5 — i.o — 0.1 0.5 0.4 0.5 — 0.0 0.4 



This treatment yields a curve very similar to the others which 

 represent the variations of the surface temperatures of the North 

 Atlantic Ocean in the coldest part of the year during our investi- 

 gated period of thirteen years. 



Characteristic features of these curves are as follows : 

 A great depression in the years 1903 and 1904, a lesser depression 

 in the year 1899, and two maximum periods in the year 1900 to 



^ The values of the anomaHes were computed as we always do with two deci- 

 mals, although we have given here but the first decimal. 



