TO CORRESPONDENTS. 
59 
perfect understanding, the two birds struck the hawk at the same moment from 
above and below, with terrific force, which knocked him clean out of the fight, for 
he sank as when descending on his prey, but really to get clear of his tormentors ; 
and, having done so, he never stopped until he had reached the friendly shelter of 
the wood. As near as we could tell this aerial fight occupied about ten or twelve 
minutes, and left an impression on our minds never to be forgotten. 
Sutton, Stirrey. James Slater. 
Lemmings. — I should be glad if anyone can tell me the dates of the migra- 
tions of lemmings during this century, and to what books reference should be made 
for information on these animals. The Naturalist in Norway gives 1863 as 
the last year of migration, but one imagines there must have been others since 
then. This book also does not give as full an account of the lemmings as one 
would wish. 
R. \V. 
TO CORRESPONDENTS. 
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below, the continual infringement of which causes the loss of time, trouble, and 
temper. 
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book on the subject. Please read Rule 4. 
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Please read Rule 5. 
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C. E. C. — Read the chapter on “ The Songs of Birds ” in Mr. Warde Fowler’.s 
Summer Studies of Birds and Books ; and his notice of IVood Notes Wild in 
Nature Notes for 1893, P- i 47 - 
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