“The most striking illustration of the influence of the great Lakes in ameliorating the climate of Canada, especially of the western peninsula, is to be found in the natural limits to which certain trees are restricted by climate. That valuable wood, the black walnut, for which Canada is so celebrated, ceases to grow north of latitude 41° on the Atlantic coast, but under the influence of the comparatively mild Lake climate of Peninsular Canada it is found in the greatest profusion, and of the largest dimensions, as far north as latitude 43°.” This subject is well illustrated by the subjoined table, showing the mean temperature and rainfall at Toronto from 1840 to 1859:-- TABLE of Mean Monthly and Animal Temperature at Toronto, Canada West, from 1840 to 1859, taken from the Records of the Provincial Magnetic Observatory, by Professor Kingston. +-----+--------------------------------------------+ | | MONTHS. | +-----+--------------------------------------------+ | | Jan.| Feb.|March.| April.| May.|June.|July.| +-----+-----+-----+------+-------+-----+-----+-----+ | | ° | ° | ° | ° | ° | ° | ° | |1840}|23.72|22.83| 30.07| 41.00 |51.38|61.27|67.06| |1859}| | | | | | | | +-----+-----+-----+------+-------+-----+-----+-----+ +-----+-----------------------------+--------+ | | MONTHS. | Mean | +-----+-----------------------------+ Annual.| | | Aug.|Sept.| Oct.| Nov | Dec | | +-----+-----+-----+-----+-----+-----+--------+ | | ° | ° | ° | ° | ° | ° | |1840}|66.12|57.98|45.27|36.65|25.97| 44.11 | |1859}| | | | | | | +-----+-----+-----+-----+-----+-----+--------+ MEAN Monthly and Annual Fall of Rain at Toronto, from 1840 to 1859. +-----+--------------------------------------------+ | | MONTHS. | +-----+--------------------------------------------+ | |Jan. |Feb. |March.|April. | May.|June.|July.| +-----+-----+-----+------+-------+-----+-----+-----+ | | In. | In. | In. | In. | In. | In. | In. | |1840}|1.480|1.043|1.553 | 2.492 |3.305|3.198|3.490| |1859}| | | | | | | | +-----+-----+-----+------+-------+-----+-----+-----+