180 



CARNEGIE INSTITUTION OF WASHINGTON. 



These birds were kept in the hold of the vessel, forcibly fed upon small 

 clupeoid fishes, and remained in good condition until released. Of the 24 

 birds which were released 13 returned to Bird Key, 3 of them returning from 

 Galveston Harbor, 785 statute miles from Bird Key, while 2 others, which 

 were released at night, in a rain, 135 miles from the nearest land (Galveston) 

 and 650 miles from Bird Key, returned to their nesting places on Bird Key. 

 Also 8 out of 10 birds which were released in the morning near the middle of 

 the Gulf of Mexico, 515 miles from Bird Key, returned. 



The following table gives a summary account of the experiments : 



Weather conditions during the period of the experiment were favorable, 

 the sea being either calm or the wind being mainly from the west or northwest. 



In another experiment, 12 noddies were captured on May 5 and sent to 

 Key West, and on May 8 were put on board the steamer Alamo and confined 

 in the hold of the vessel, and all 12 birds were released at the entrance of 

 Mobile May on May 13 at 5^ 55"^ a. m. Only one of these birds returned to 

 Bird Key, this one taking 7 days and 1 hour to accompHsh the journey. 

 The weather conditions were unfavorable, there being heavy southerly and 

 southeasterly winds. 



The Effect of the Amount and Frequency of Practice in Learning Archery, 

 by John B. Watson and K. S. Lashley, 



These experiments upon learning in the human being are to be continued 

 for several years. During the past season we obtained the learning curves 

 of eight individuals; four of the eight subjects were scientific men, while the 

 other four were chosen from the force attached to the laboratory. 



In this preliminary work each man shot twelve 28-inch arrows from a 

 44-pound bow at a 48-inch target covered with white canvas. In the center 

 of the target a solid black circle, 10 inches in diameter, was painted (to take 

 the place of the gold). The range was 40 yards. 



We have data not yet completed upon the initial accuracy of men not 

 trained in the use of the long bow, upon the relative rapidity of learning of 

 the individuals and of the two groups of men; and upon the course of learning 

 (i. e., whether the learning curve is continuous or shows "resting" places or 

 "plateaux"). 



Further work will undertake to show the effects upon different groups of 

 individuals (of like initial scores) of different amounts and frequency of 

 practice. It is planned to work five groups. The first group to shoot 5 

 arrows per day, the second 10, the third 20, the fourth 40, and the fifth 80. 



