8io 



POPULAR SCIENCE MONTHLY. 



spontaneous daily movement of each dog with no indication as 

 to its quality. Something to give a qualitative expression of 

 strength, ability, and resistance to fatigue was devised, which 

 consisted in a series of competitive tests at retrieving a ball. 



ALCOHOL TO BUM 35 G. DAILY 



NO ALCOHOL GIVEN 



<iO 



80 



70 



60 



50 



40 



30 



20 



10 



17 18 17 20 

 NIG RETRIEVES 



- ATTEMPTS 



BUM RETHIEVES.. 



' ATTEMPTS -- 



21 



Zi. 2.3 14- A5 26 27 26 29 30 



Fig. 18. Curve of Efficiency (Competitive). In a difficult competitive test calling for 

 endurance, sustained attention, etc., the alcoholic falls much lower relatively than in 

 ordinary daily activity, Bum attaining to only thirty-two per cent of Nig's efficiency. 



The balls were thrown in rapid succession across the university 

 gj mnasium, one hundred feet, and a record was kept of the dogs 

 that started for it and of the one that succeeded in bringing it 

 back. One hundred balls constituted a test, and to throw them 

 consumed about fifty minutes. 



In the first series, consisting of 1,400 balls thrown on succes- 

 sive days, January, 1896, the normal dogs retrieved 923, the alco- 

 holics 478. This gives the alcoholics an efiiciency of only 51 "9 

 per cent as compared with the normals. Bum's ability in this 

 series as compared with Nig's is only thirty-two per cent.* (See 

 Fig. 18.) It was also noted that Bum and Tipsy were much 

 more easily fatigued than the normals. 



A second series, of 1,000 balls, November, 1896, in which Bum 

 and Nig were tested, gave similar results. The various elements 



* The results from Topsy and Tipsy were not comparable, on account of Topsy's condi- 

 ,tion at the time. 



