...is now England many alternations of long periods of heat and cold. Whenever the area became wanner, the descendants of semi-tropical forms would gradually...the earliest arrivals of the incoming vegetation. Such is a possible explanation of our finding these plant-remains commingled together. It must, too,...

...in England, there are to the geologist unmistakable indications of many changes in climate. Further, astronomers, having calculated the path of the revolution...lingering remnants of the retreating vegetation (though perhups existing with diminished vigour) growing alongside of the earliest arrivals of the incoming...

...the descendants of semi-tropical forms would gradually 260 NATURE creep further and further corth, whilst the descendants of cold-loving plants would...the earliest arrivals of the incoming vegetation. Such is a possible explanation of our finding these plant remains comingled together. It must, too,...

...gradually colder, the heat-loving plants would, from one generation to another, retreat farther and farther south, whilst the cold-loving plants would return...vegetation (though perhaps existing with diminished vigor) growing alongside of the earliest arrivals of the incoming vegetation. Such is a possible explanation...

...whilst the descendants of cold-loving plants would retreat from the advancing temperature, vice versa. Whenever the area became gradually colder, the heat-loving...the earliest arrivals of the incoming vegetation. " Such is a possible explanation of our finding these plant-remains commingled together. It must be...

...whilst the descendants of cold-loving plants would retreat from the advancing temperature, vice versa. Whenever the area became gradually colder, the heat-loving...would, from one generation to another, retreat further aud further south, whilst the cold-loving plants would return to the area from which their ancestors...