GENETIC TYPE AND THE ENDOCRINES 



631 



General activity was the most obvious factor to consider, 

 and two methods were employed in estimating this. In the 

 first method, a pedometer was attached to the dog to record 

 each step. Since all the pedometers were on the same ad- 

 justment and were alternated from dog to dog, a fairly 

 accurate quantitative rating could be obtained for each animal. 

 In the second method, the animal was placed in a specially 

 constructed run in which the floor was mounted on springs. 

 By the use of a bellows between the framework of the run 

 and the vibrating floor, the dog's movements were transferred 



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Text-figure 112. Differences in activity among all the dogs, obtained by 

 attaching pedometers to the animals. 



into air pressure variations which were recorded on a slowly 

 revolving kymograph by means of a closed tube from the 

 bellows to a Marey tabour and stylus. Characteristic records 

 are shown in text-figure 111. A more comprehensive test of 

 activity is shown by the pedometer records in text-figure 112. 

 These records clearly show the bassethound to be relatively 

 inactive and the Saluki and German shepherd highly active. 

 The hybrids distribute themselves between these two ex- 

 tremes, with some, as for example 246 $ and 1153 $ (an F^ 



