136 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 70 



for Petersen's stations VIII and VII combined (curve PVII- 

 VIII) ; Stations VI and V (PV, VI) ; stations IV and III (P 

 III and IV) and stations II and I (PI, II). We give the cor- 

 responding curves for Liepe's stations, I, II, III, V-VII (see curves 

 L.I to L.VIII). 



We see that the curves for Petersen's stations agree well to- 

 gether. The greatest disagreement we find in curves P VII-VIII 

 for stations VIII and VII the two most westerly of the stations, 

 used where it would be expected since the isotherms lie so near 

 together. Elsewhere one finds a gradual transition in these curves 

 from west towards east, and then a further transition from the 

 curve PI II, for Petersen's most easterly stations II and I to the 

 curves for Liepe's stations I and II (curves LI, LII) and further 

 southward. 



The development in these curves is so gradual that without 

 having noticed the transition a type is obtained in the curves L-III, 

 L-V and L-VI which in its principal features is opposite to the 

 type of the curves P-VII to P-VIII and P-V to P-VI. To a great 

 extent we find maxima in the last curves as opposed to minima in 

 the first. It is exactly the same opposition which we have already 

 several times mentioned between the temperature variations in the 

 middle parts of the North Atlantic Ocean (P-VII-VIII, P-V-VI, 

 L-VII, L-VIII) and in the most eastern parts of it (curves L-I, 

 L-VI). We see here that this eastern effect stretches southwards 

 at least up to Liepe's stations VI at i8° north latitude, between 

 Africa and the Cape Verde Islands. 



All these curves in figures 55 and 56 show good agreement in 

 the temperature variations which prevail on the one side over wide 

 stretches of the Middle Atlantic Ocean and also of the Indian 

 Ocean, and on the other side over wide stretches of the most 

 easterly part of the Atlantic Ocean between the tropics and 60° 

 north latitude. 



Our figure 56 shows still more. The curves for the middle part 

 of the ocean (curves P-VII-VIII, P-III-VI, L-VII, L-VIII) have 

 in part similarity to the inverted curves of sun spots and promi- 

 nences (curves Si and R^, at the top of the figure) while the curves 

 for the most easterly part of the ocean, particularly the curves 

 L-II and L-IV show more similarity to the direct curves of sun 

 spots and prominences (curves So, Ro and PC). 



As one may see, there is in these different curves an indication 

 of a two-year period (see fig. 55, curves I, V, VI; fig. 56, curves 



