INTRODUCTION 



MOTTO. 



,,Just as Meteorology was only a mass 

 ofstatistical data beforethe simultaneous 

 facts were, day by day, schematised, so 

 will Ornithophaenology remain but a 

 mass of statictical data, until the compi- 

 lation of the simultaneous observations 

 and the schematising of the Phenomena 

 of Migration, at least in regard to some 

 peculiarly characteristic species, is carried 

 out-.J. Heoyfoky „Aquila" VI 1899.p.9. 



