46 THE ROYAL SOCIETY OF CANADA 



ently it may take place at any time within a period of three or four 

 months. There are gaps between the dates, it is true, but none are 

 of very great length and the search in every case, particularly if none 

 or few were found, was sufficiently prolonged to get accurate informa- 

 tion as far as the area in question is concerned. 



