Show the rail rf alic acif it is a curious phenomenon this annual fill of all the loaves from almost all alio trees in north cin climates anil yet use has so dulled in to its strangeness that we seldom even about its origin or moaning in any way indeed until certain alio tertiary boras by M Sau orta mr and others ful whether anybody had over asked himself any question upon the subject at all kut these investigations have shown brutty clearly that deciduous trees are quite a modern novelty upon our planet things of alio last twenty or thirty millennia or so entirely duo to tha immense cooling of alic earths surface which banan in tho early period and terminated in aliu great glacial they am a special product of hard times at the pule like the whito bears tins woolly rhinoceros alic mim moth and alic snow buntings in tho tropics all alie trees arc or at least nu regular loss of thair thuir foliage but in alio north we have a few nativo evergreens ever greens except thu pines and airs willi needle bliku liku and the two or ahrea hardy broad leaved exotic evergreens ever greens cultivated in our gardens ur shrubberies eries lucli as alio llio rhododendron tho laurels and alic bay trees together our smaller holly vet hardly saif lico to convoy a notion of aliu great southern foiest trees clad all alio year round in thick green such us thu gocs tho alar and tho buc up to alic beginning of alio llio tertiary period large of what is now alio tropical tapu covered alio whole of tho world n acry pyles nuil tsiun ano fur asta of alio samo AS chosu which now si cid tho ltv lut from alio first dawn of tho onward somo coni of and geographical causes lucli as those aurgust rd by dr aroll and air A 11 callaco Wal laco began to produce a general cli illin of alic temperature at either biolo hapa the etl acl wib wholly due dr croll believes to the eccentricity of alio llio earths orbit and tho precession of tho equinones equinoxes es perhaps it was further aided as mr callaco suggests by tho elevation of gi cut mountain ranges about tho polar regions which became nurseries for immense glaciers and so supplemented the natural chilling buu to tho cosmi oal cycles at any rate whatever theory we may adopt for its explanation tho act itself remains certain that from tho ago up to the glacial epoch the climata of the earth grew steadily colder the change being of course moat marked at and least noticeable in the equatorial district a mail gazelle in ono of tho switzerland land slides a whole tract of wood slipped down a hillside and spread over somo nua dowd without uprooting or even injuring the trees thus at uno stroke a tract of a maw of forest land |