144 Professor Gordon on the Temperature of the Earth. 



Table I. b. — Temperatures of each successive Layer. 



Surface. Sur. to 1 in Sur. to 16 in. Sur. to 24 in. Sur. to 32 in. Sur. to40ir 



Jan 122 125 1-50 192 224 246 



Feb 1-84 1-81 2*02 2-31 2-51 262 



March,... 66J 5*98 5-88 5'78 5-68 5*59 



April,.... 10-07 9-07 8-89 8-73 8*55 8-44 



May, 1518 14*33 14*15 13-86 1360 1329 



June,. ...17*25 1657 1652 16-40 1616 1599 



July, 1709 1654 16-62 1654 16-44 16-36 



Aug 17-70 17-30 17-39 17-36 17-25 1718 



Sept 13-56 14-39 15-03 15*38 1556 15-71 



Oct 9-76 9-83 10-31 10-75 11-10 11-40 



Nov 5-74 6-03 6-49 6-95. ."... 7'32 7*58 



Dec 1-73 218 279 413 443 4-66 



Table I. c. — Difference of Temperature of Layers and Surface. 



4 Inches. 16 Inches. 24 Inches. 3.' Inches. 40 Inches. 



Jan 003 0-28 0'70 1-02 1-24 



Feb 0-03 0-18 0-47 0*67 0*78 



March,... 063 073 0'83 093 1-02 



April, 1-00 1-18 1-34 1-52 1-63 



May, 0-85 1-03 1-32 1-68 1-89 



June, 0-68 0*73 0-85 1-09 1-26 



July, 0-55 0-47 0-55 0-65..... ... 0-73 



Aug 0-40 0-31 0-34 045 0'52 



Sept 0-83 1-47 1-82 2-00 2-15 



Oct 0-07 0-55 0-99 1-34 1-64 



Nov 0-29 0-75 1-21 1-58 184 



Dec 0-45 1-06 2-40 2-70 293 



These differences naturally increase with the depths. 



The Upsala experiments (made by Rudberg,) give the following results: — 

 Table II. a. — Mean Temperatures at Depths. 



Air. 2 Feet. 4 Feet. 6 Feet. 10 Feet. 



Jan -6-43 0'56 2-50 3-96 5-96 



Feb -6-73 0-95 1-50 2-97 ...503 



March, -3-75 0*87 0*97 2'21 6-24 



April, 2-37 0-94 122 193 375 



May, 9-64 701 433 377 386 



June, 14-56 1393 10-15 776 534 



July, 16-03 1607 1298 1065 751 



August,... 14-88 15-85 13-88 12-00 9-12 



Sept 11-60 13-12 12-54 1183 991 



October,... 4'95 7'98 9'43 10-02 976 



November, 0'46 3-97 6-04.... 7'49 8'71 



December, 255 178 373 530 7-28 



