134 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. /O 



for the three southerly fields, curve V, the most northerly of them, 

 near the Portuguese coast, has most similarity to curve I, while 

 curve VII for the field on the equator more in the middle of the 

 Atlantic Ocean, shows, as was to be expected, more similarity to 

 curves III and IV. 



In figure 55, we give the curves for the year temperature by con- 

 secutive twelve-monthly means which were earlier obtained for 

 the Dutch 10° squares in the Atlantic Ocean at 15° to 24° north 

 latitude and 35° to 44° west longitude, 5° to 14° north latitude, 

 25° to 34° west longitude (see curves VIII and IX), and in the 

 Indian Ocean 0° to 9° north latitude, 70° to 79° east longitude, 

 0° to 9° north latitude, 80° to 89° east longitude (see curve X and 

 XI. ).^ Curve IX has, as was to be expected, much similarity to 

 curve VII for the field on the equator. The two curves X and XI 

 for the Indian Ocean have also much similarity to the Atlantic 

 tropical curves. On the other hand the curve VII for the most 

 northwesterly Dutch field, at 15° to 24° north latitude and 35° to 

 44° west longitude, has a more mixed character. The first part, 

 up to the years 1905 or 1906, bears much similarity to curves V and 

 VI and also with the curves X and XI of the Indian Ocean, while 

 the last part has less similarity with the other curves and goes in 

 part opposite to the more equatorial curves VII and IX. 



It has been shown that the monthly temperature values for Peter- 

 sen's single stations in the Atlantic Ocean along the route Channel 

 to New York can not be regarded as entirely trustworthy, particu- 

 larly in the western part of the ocean. If, however, we employ 

 the temperatures of the eastern stations east of 47° west longitude, 

 (see fig. 13) and the monthly means for two and three stations 

 combined, it is to be expected that we shall obtain comparativelv 

 trustworthy values, particularly if we take twelve-monthly con- 

 secutive means. The temperatures in this part of the ocean, particu- 

 larly in the most easterly parts, east of 40° west longitude, are 

 indeed comparatively uniform over great stretches. The four curves, 

 P \TI-VIII and P I-II of figure 56 give the values obtained in this 

 way for successive twelve-monthly consecutive temperature means 



^ As mentioned already, the values found for the temperature for these 

 Dutch fields in the Atlantic Ocean are not very trustworthy since the fields 

 are too great and the observations for each month often very few. In spite 

 of this one may perhaps hope that the worst inaccuracies are eliminated in the 

 twelve-monthly means. The temperature values for the two fields in the 

 Indian Ocean are better, for the observations are much more numerous and 

 the relations are very similar. 



