. The Canadian field-naturalist. *5. -4n occupied beaver habitat in Algonquin Park. the field as permanent originals consisting of two parts: the notes completed in the plots, called square data, and the notes of travel off the plots called traverse data. The former possessed the most reliable information. Only these were re- garded as having true sample significance. To facilitate the compilation of the monthly reports and to serve as daily permanent briefs, all notes were summarized daily on a special biological form entitled, "Dailj' Simimary Form for Beaver Work for the Season of 19—&
. The Canadian field-naturalist. *5. -4n occupied beaver habitat in Algonquin Park. the field as permanent originals consisting of two parts: the notes completed in the plots, called square data, and the notes of travel off the plots called traverse data. The former possessed the most reliable information. Only these were re- garded as having true sample significance. To facilitate the compilation of the monthly reports and to serve as daily permanent briefs, all notes were summarized daily on a special biological form entitled, "Dailj' Simimary Form for Beaver Work for the Season of 19—". The numerical results have been outlined above foi' the whole park. These figures really represent a mean of the bea^^er activity observed through the two seasons' work from spring to autumn when the population of beavers showed the least and most activity respectively. It may be sur- prising to learn that while 370 fresh beaver houses were recorded only 15 beaver occupants were seen representing about per cent of the population believed to have been present. The distribution of the beavers in the park was foimd to be ;t concentrated thi'oughout the centre, while they were notably scarcer in the country adjacent to the park line. All sample areas, except one, possessed at least one beaver house. The greatest n\unber of occu- pied beaver houses found on one square mile was 10, while the most dams in use on one sample plot were 39. The average density of occupied beaver houses per sample plot was fresh houses, corresponding to an average sample plot with a high average density of beaver waters, habitats or beaver basins as they are called, in this case basins, which is greater than the density of beaver basins on an average square mile of Algonquin Park. Thus the probable density of fresh beaver houses on one aA'erage square mile of Algonquin Park becomes occupied beaver houses when the average density, of fresh beaver houses from the sampl
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