36 



about 6 miles. Oct. 2nd, south-west in morning, west in afternoon, south in evening ; 

 mean velocity about 7 miles. Oct. 3rd, west morning and afternoon, north-west at night ; 

 mean velocity 15 miles. Oct. 4th, west throughout the day; mean velocity 10 miles. 

 Oct. 5th, north-west throughout the day ; mean velocity 9 miles. Oct. 6th, south-west 

 morning and afternoon, south at night ; mean velocity 10 miles. Oct. 7th, east in the 

 morning, south in afternoon, north at night ; mean velocity 4 miles. Oct. 8th, 

 north morning and afternoon, west at night ; mean velocity 2 miles. Oct. 9th, north in 

 morning, west during remainder of the day • mean velocity about 5 miles. 



From the foregoing meteorological observations we may certainly gather that there 

 was nothing in either the direction or force of the prevailing winds during the first 

 week of October to prevent the cotton moth from flying to Canada from the southern 

 cotton fields, which lie almost entirely to the south-west of us. In the next place, we 

 may conclude that the winds during the first few days of October, though light, were 

 such as would help the flight of the moth in this direction. For the first four days 

 they were nearly always south-west or west, and on the 3rd, when they were at their 

 highest velocity in Toronto, they were south-west. On the whole the meteorological 

 conditions were, I consider, distinctly favourable to the migration of the insect from the 

 southern States to Ontario ; the weather was warm, free from frost at night, no heavy 

 showers of rain, a moist atmosphere, and winds for the most part in a direction to aid 

 the flight thitherward. 



In conclusion, I must confess myself to have changed from a strenuous supporter of 

 the indigenous theory to an equally firm believer in the opinion upheld by Prof. Riley 

 and Mr. Grote, that the moth may occasionally breed for a season in the north, but that 

 its home is in the south, and that the specimens we observe here have flown to us over 

 wide tracts of country from the cotton fields far away to the south-west. 



I trust that in future seasons, further observations may be made, and that in time 

 we may be able to trace the route by which this interesting immigrant so frequently 

 travels to our land. 



