. The Canadian field-naturalist. . Fig. 2. Green ash in second foliage after frost-kill of May 9-10, 1946, at Medicine Hat, Alta. planted in good soil alongside a building at Suffield, Alta., was completely withered by direct desiccation. Again, some specimens of the Alberta white spruce (Picea glauca al- bertiana) were transplanted from their mountain home at Seebe, Alta, to Suffield in June, 1945, when they were 7 feet high. By diligent watering they were carried through that summer and were able to develop buds, which began to open in May of 1946. All the lateral buds turned out to be cones
. The Canadian field-naturalist. . Fig. 2. Green ash in second foliage after frost-kill of May 9-10, 1946, at Medicine Hat, Alta. planted in good soil alongside a building at Suffield, Alta., was completely withered by direct desiccation. Again, some specimens of the Alberta white spruce (Picea glauca al- bertiana) were transplanted from their mountain home at Seebe, Alta, to Suffield in June, 1945, when they were 7 feet high. By diligent watering they were carried through that summer and were able to develop buds, which began to open in May of 1946. All the lateral buds turned out to be cones instead of shoots. The terminal growth was however sufficient to support the trees, as shown by the accompanying photograph (Fig. 1), taken in 1947. An exceptionally heavy late spring frost occurred on the night of May 9-10, 1946, when the temperature fell to a minimum of 19° F. The preceding 3 weeks had seen warm sunny weather, and all the trees of Medicine Hat, Alta. were in leaf. The frost resulted in the complete destruction of the foliage of green ash (Fraxinus pennsylvani- ca), the choicest available shade-tree for the city. The foliage of Manitoba maple (Acer Negundo) was partially killed, and the leaves of the Cottonwood (Populus deltoides) were slightly affected. The ash put forth a com- plete replacement of new foliage within 3 weeks, by the development of lateral buds which must evidently be normally suppress- ed. A photograph taken at this time (Fig. 2) shows the bizarre appearance of the trees, with the dried remnants of the frost-killed foliage still hanging on them. — A. W. A. BROWN, University of Western Ontario, London. Recent Bird Records for the Ottawa District. 1. American Brant. Branta hernicla. In the afternoon of October 8, 1949, fifteen were observed at Britannia, Ontario, by H. Brown, E. Mills and mysielf. They flew directly overhead in a close "V" formation. Flocks of Brant num- bering from 3 to 39 were seen by local natu- ralists until N
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