176 



OTTO C. GLASER 



on the average 4.39 seconds, for the adults 6.89 seconds; the 

 former represents an increase of 53 per cent in efficiency, 

 whereas the adults improved 62.1 per cent. 



DURATION OF THE HABIT 



That a habit formed under stress during brief periods of intense 

 activity, may endure from fifteen minutes to several hours, the 

 records already given show plainly. Special tests were made, 

 however, to determine, if possible, whether any traces of the 

 heightened efficiency might be found after several days. For 

 this purpose, animals A, B, and C, of the preceding group of 

 young were used, and adults A, B, C, D, E, and F, upon whose 

 records fig. 2 is based. In the present connection I shall dis- 

 tinguish the three young animals by small letters, the six adults 

 by means of capitals. 



AVERAGES 



4/26 

 4/26 



4/27 



4/26 



4/26 

 4/27 

 5/9 

 5/9 



4/26 

 4/26 



4/27 



2.15 p.m. 

 3.28 p.m. 

 2.15 p.m. 



2.30 p.m. 



3.35 p.m. 



2.30 p.m. 

 10.20 a.m. 

 10.45 a.m. 



2.50 p.m. 

 3.43 p.m. 

 2.50 p.m. 



Seconds 

 4.58 

 1.34 

 4.69 



5.15 

 4.75 

 3.30 

 5.65 

 2.10 



13.40 

 4.79 

 7.00 



The adults A, B, C, D, E, and F, whose records on January 

 15th, 20th, 22d, and 28th follow, were all used prior to December 

 11th of the year before, but unfortunately the earlier experi- 

 ments were not performed under exactly the same conditions as 

 those made in January, and a comparison of records separated 

 in time by more than a month cannot be made. The results 

 of the series separated in time by five days, by two, and again 

 by six, can, however, be safely compared. 



