ON ORNITHOLOGY. 41] 
I consider this to be a very interesting question, and further 
researches may very materially increase our knowledge of the 
instinct of birds, their wanderings and the extent of ground 
they traverse in the pursuit of prey. In this latter respect, 
especially in the case of the raptorial birds, we seem to draw 
the line rather too tightly. 
In the spring of 1878 I had frequent opportunities of 
observing the Cinereous Vulture at its nest. In the splendid 
woods of Syrmia it breeds everywhere, and starting from the 
village of Cerevié on the right bank of the Danube I made, as 
already related, a series of excursions among the wonderful 
forests of the Fruska-Gora. 
Everywhere I met with Cinereous Vultures. I saw them 
eruising high aloft, looking out for plunder, sitting on the old 
oaks, gorged, and also busy at their nests, but never more 
than eight of them together. 
In those districts the Cinereous Vulture is a true forest- 
bird as regards its nesting and roosting-places, for both are 
situated in the midst of woods many miles in extent. Its food 
it seeks beyond the wooded mountains, among the bare stony 
hills that slope partly northwards to the Danube and _ partly 
southwards to the valley of the Save, and I am also quite 
convinced that the Cinereous Vultures which breed in the 
Fruska-Gora range into the Bosnian and Servian mountains 
in search of food, the great wing-power of this bird allowing 
me to draw this conclusion with safety. 
This vulture likes to rest on rocks during the afternoon, 
and where they are scarce appears to search for them, for we 
found in the midst of the Fruska-Gora woods only one very 
small group of rocky pinnacles, which were, however, crowded 
with vultures in the afternoon, while the incredible quantities 
of droppings, castings, and feathers lying about them showed 
that the spot must be a favourite resort of these huge 
raptorial birds. 
