1881.] Notes on Physical Geology. 477 



North era Hemisphere. 



Lat. N. 



Annual Eange. 



if resent oecular 

 Range. 



tit ■ * a i 

 Ivlaxiinuni" secular 



Range. 











o 



o 



-037 F. 



o 







2-2 F. 



-185 F. 



10 



4-5 „ 



0*075 „ 



0-375 „ 



20 



13 2 „ 



0-220 „ 



1 -100 



30 



24-8 „ 



0-413 „ 



2-065 „ 



40 



33-0 „ 



0-550 „ 



2-750 „ 



50 



44-2 „ 



0-737 „ 



3-685 „ 



60 



55-3 „ 



0-922 „ 



4-610 „ 



70 



59-8 „ 



0-997 „ 



4-985 „ 



80 



59-1 „ 



0-985 „ 



4-925 „ 



The secular range of mean annual temperature in the southern 

 hemisphere is as follows : — 



Southern Hemisphere. 



Lat. S. 



Annual Range. 



o 









2 °2 F. 



10 



7-0 „ 



20 



10-5 „ 



30 



13-3 „ 



40 



11-8 „ 



50 



8-5 „ 



60 



6-5 „ 



Present Secular 

 Range. 



0-037 

 0-117 

 0-175 

 0-222 

 0-197 

 142 

 0-108 



Maximum Secular 

 Range. 



185 

 -585 



0- 875 



1- 110 

 0-985 

 0-710 

 -540 



As extreme examples of the respective types of climate in the 

 northern and southern hemispheres, I may give the result of my calcu- 

 lations for ISTorth Grinnell Land and Kero-nelen Island. 



North G-rinnell Land 

 Kerguclcn Island .... 



Lat, 



Present Mean 

 Annual Temperature. 



Maximum Secular 

 Range. 



81° 44 N. 

 50 OS. 



-2-42 F. 

 + 40-7 „ 



6°5 F. 

 0-9 F. 



* Because the maximum eccentricity of the earth's orbit is x^th instead of ^th, 

 as at present. 



