228 



Dr. A. Woeikof s Examination of 



ocean-currents, I will take the mean January temperature in 

 the strictly continental climate of Eastern Siberia under 

 120° E. According to FerreFs tables : — 



Under 50° K, we have 0° F. 



60° N. 



-30° F. 



If the January temperature decreased from 50° to 60° EL, 

 according to the hypothesis of Dr. Croll, it should be under 

 60°K=-155°-3. 



But to be quite sure of taking the most favourable case 

 for the hypothesis of Dr. Croll, I take the highest January 

 temperature under 50° EL in Ferrel's tables, i. e. that at 

 20° W. = 44° F., and the coldest January temperature under 

 60° N., i. e. that at 120° to 130° E.= -30° F. Yet, in pro- 

 portion to the quantity of heat received, the mean tempera- 

 ture of January at 60° K should be = -140° F. 



The following Table gives the results of the three cases 

 considered: — 





Mean tem- 

 perature 



50° N. 



Mean temperature 60° N. 



On the 

 hypothesis 



of 

 Dr. Oroll. 



Actual. 



Difference. 



Mean January tempera- \ 

 ture of all meridians. J 



Mean January tempera- 1 

 ture in 120° E. (East I 

 Siberia) J 



Mean January tempera- \ 

 ture of warmest meri- j 

 dian under 50° N. and )■ 

 coldest meridian under j 



60° n ; 



o 



213 

 



44 



-147-9 

 -1553 



-140 



o 



1-7 

 -30 



-30 



1496 

 125-3 



110 



If the discrepancies are so great in taking even the means 

 of a whole parallel, or strictly continental climates, and even 

 in the last example, how much must Dr. Croll's calculations 

 for Great Britain be wrong. In so oceanic a climate an 

 equal difference in the amount of sun-heat will certainly cause 

 a smaller fall of temperature. 



I give another example, which shows how little the method 

 of Dr. Croil is applicable even to the mean annual tempera- 

 tures. In Chapter IX. of ' Climate and Cosmology ' he states 

 that the difference of temperatures between the equator and 

 the north pole ought to be at least 200° F. if they were in 

 proportion to the heat received from the sun, and the tempe- 

 rature of space ( — 239° F.) was taken as the initial one; but 

 actually the difference is but 80° F. This small difference, 



