FLORIDA STATE HORTICULTURAL SOCIETY. 
37 
ments, careful observations and detailed 
records have been in use, but these show 
no change. Speaking from a geological 
standpoint, the climate is indeed grow¬ 
ing warmer. There is evidence of glacial 
drift with Arctic weather as far south 
as Ohio, and the same is true of Central 
Europe. These geological changes, how¬ 
ever require thousands of years for their 
manifestation and we need not suffer 
any fear that our citrus isotherm will 
move far enough north to make it too 
tropical for any orange groves that may 
be planted near it within the limits of 
our present civilization. 
DISCUSSION. 
Prof. Rolfs—We have cords of sta¬ 
tistics on records of weather and cli¬ 
mate, but we have not a single man 
who can interpret them or make any 
use of them. We are now getting our 
climatological records in a little more 
accessible shape than they were twelve 
or thirteen years ago. 
