64 REPORT ON THE MIGRATION OF BIRDS. 
warm.—FEarly, nothing, and during daytime almost nothing, in 
spite of fine weather. C. cornix and monedula, very single small 
flights. No Sturnus, no merula, no Woodcocks shot. S. titys, | 
one. J. celebs, cannabina, chloris, as Anthus all very single. 
Strange, that in forenoon, after all hoar-frost had disappeared, 
and it became quite warm and sunny, not a merula or scolopax 
arrived, and no Crows passed, the few flights of the latter pass- 
ing surprisingly high, certainly several thousand feet, which is 
very uncommon, as the usual normal boundary is 500 to 
600 feet. Can this give rise to the conclusion that other species 
whose normal route of migration lays always very high, should 
under the influence of hoar-frost migrate so high that they can 
neither be seen nor heard, which would be in the case of Crows 
about 10,000 feet ? 
In rare cases I have seen Rooks and Daws pass so high, that 
my attention being roused by their call, they were only visible 
in the shape of very fine dust. 
The same also happens that under favourable atmospheric 
circumstances, the calls sound down clear from a height to 
which the sense of sight is unable to penetrate. 
April *? 
Ist, westerly, slight sunny; warmer. Highest cirri, N.O.— 
Only very little visible migration. The few flights of Corv. cornix 
and monedula extraordinary high, 3000 to 4000 feet. Merula, 
not many; more than half old ?. Musicus and tliacus, some. 
Rubecula, Accentor, Regulus fl., Sax. enanthe and rubreola, all 
only few. Mot. alba, Anth. pratensis and rupestris, pretty 
many. Larks, few. Jr. celebs, montifringilla, cannabina, and 
montium, all pretty many. Scolopax rusticula, a couple. Anas 
nigra 6, very many on the sea. 
2d, N.N.W., light; early fog, flying clouds, W.S.W.; P.M. 
North overcast, cold.—Nothing during daytime. Early, from 
three to four o'clock, Woodcocks and Thrushes. Five to seven 
fog; in evening cold, clouds very slow from North. Sy. tetys, 
a couple. Merula, very few. | | 
3d, N.E., fresh, cold, clear; early, hasty cloud-flocks.—Nothing. 
F. esalon and tinnunculus, of each a couple. Jerula, passing 
the whole day singly. Al. alpestris, pretty many. Scolopax, 
singly. 
