. Geological magazine. abodes of living organisms. Any appeal,therefore, to the internal heat of the earth in explanation of abundantanimal and plant life in high Arctic regions, either in Palasozoic orNeozoic times, must be deemed unsatisfactory at the present day; andthe key to the solution of the problem must be sought either in achange in the inclination of the earths axis, an increase of the sunsheat, or probably in a combination of these causes together with acomplete change in the relative distribution of land and sea in bothhemispheres. Prof. Heer seems to regard the absence of lightdu
. Geological magazine. abodes of living organisms. Any appeal,therefore, to the internal heat of the earth in explanation of abundantanimal and plant life in high Arctic regions, either in Palasozoic orNeozoic times, must be deemed unsatisfactory at the present day; andthe key to the solution of the problem must be sought either in achange in the inclination of the earths axis, an increase of the sunsheat, or probably in a combination of these causes together with acomplete change in the relative distribution of land and sea in bothhemispheres. Prof. Heer seems to regard the absence of lightduring the long Arctic winter as unimportant, provided the heatwas only maintained well above freezing-point. Even the insectsof the Coal Period he believes to have been chiefly nocturnal. Butthere were many diurnal insects present in the Coal Period besidesthe nocturnal Termites and Cock-roaches.^ The accompanying figure is (together with others), by the courtesyof Mr. Heywood, reproduced from Prof. Heers work. Fig.
Size: 1086px × 2301px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorwoodward, bookcentury1800, bookdecade1870, bookyear1877
