Assertion: snow goose's time | /r/HasProperty | determined by the advance of the season
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Source sentences:
text: The general spring migration of the Canada Goose, may be stated to commence with the first melting of the snows in our Middle and Western Districts, or from the 20th of March to the end of April; but the precise time of its departure is always determined by the advance of the season, and the vast flocks that winter in the great savannahs or swampy prairies south-west of the Mississippi, such as exist in Opellousas, on the borders of the Arkansas river, or in the dismal "Everglades" of the Floridas, are often seen to take their flight, and steer their course northward, a month earlier than the first of the above mentioned periods.