214 ANIMALS AT WORK AND PLA Y 



define the geographical limits of many European, 

 Central Asian, and Chinese species, and recorded, 

 among other observations in his second book, Siberia 

 in Asia^ that Siberia * is a second Canada in reserve, 

 waiting for a European overflow.' 



The interesting point about the birds' migration 

 to lands of promise is that they do not ' wait.' They 

 have a colonial agency quite independent of time, 

 and working with an accuracy which no 'labour 

 bureau' can equal. 





