562 



FROM NORTH POLE TO EQUATOR. 



thougli only a very small fraction of the feathered population 

 could be seen, and indeed the tide of migration was still in full 



Fig. S2 — Nebt of the lendulinti Titiiuube {Pai Ui, pcadultuu^) 



flood. Great flocks of black terns flew in almost unbroken 

 succession up the river, sometimes assembling in compact swarms, 

 sometimes distributing themselves over the whole breadth of the 

 flooded Danube; hundreds of glossy or dark ibises wandered up 

 and down the stream, flying in the usual wedge-shaped order 



