276 'Journal of Comparative Neurology and Psychology. 



Inspection of Tables III and IV shows that the number of 

 eggs oviposited in each group; that is, after each successive stimu- 

 lation, is also variable, being, however, on the average no less 

 variable on the first day than several days later. 



The strength of the stimulus, as employed, not being measur- 

 able, the connection between this and the response was not deter- 

 mined but is conceivably a potent, though probably not a controll- 

 ing, factor in determining the character of the response. 



The same relative variability prevailed from day to day and from 

 group to group upon the same day as to number of eggs in a group 

 in both normal and decapitated (stimulated) moths, due prob- 

 ably to variability in strength of stimulus and other unknown con- 

 ditions. On the whole, unmated moths oviposited fewer eggs at 

 any one time than the mated moth, as in the normal insect. This 

 suggests a connection between activity of the reproductive mech- 

 anism and the presence of sperm in the female receptacle. The 

 average time rate of egg placing in the decapitated moth varies 

 from group to group upon the same day and from day to day as 

 the following examples show. 



SERIES II. 



A issued Sept. 22, a. m., mated Sept. 23, p. m. 4, decapitated Sept. 24, p. m. 1.30. 



Time rate of ovipositing after stimulation. 



1st group, Sept. 24, p. m. 5.35—14,6,9,8,20,7,21, 11,20,20,8, 7, 8, 17, 15, 



8, 8, 8, 9, 37, 67. Av. of I per 15 sec. 



2d group, Sept. 24, p. m. 5.45— 3» 21, 1 1, 9, 25, 10, 10, 12, 7, 8, 9, 10, 15, 1 1, 24, 8. 

 Av. of I per 12 sec. 



3d group, Sept. 24, p. m. 8.15—4, 11,23,30,20, 7, 13, 15, 14, II. Av. of I per 

 14 sec. 



B issued Sept. 4, a. m., mated Sept. 4, p. m., decapitated, Sept. 5, p. m. 1.30. 

 Time rate of ovipositing after stimulation. 



1st group. Sept 10, a. m. 8.30 — 3, 16, 25, 6, 14, 9, 3, 25, 16, 27, 6, 20, 9, 11,8, 10, 

 9.36, I5> 15. 7> 21, 7, 13, II, 15, 13,12,8,15. Av. of I per 10 sec. 



2d group, Sept. 10, a. m. 8.35—58, 7, 13, 15, 9, 13, 9, 25, 13, 7, 9, 15, 9. Av. of 

 I per 15 sec. 



3d group Sept. 10, a. m. 8.40- — 18, 8, 18, 7, 20, ^^, 17, 15, 9, 16, 19, 14, 13. Av. 

 of I per 17 sec. 



4th group, Sept. 10, a. m. 8.45—20, 7, 29, 17, 10, 13, 14, 14, 14, 14, 15, 6, 27, 10, 



9. Av. of I per 14 sec. 



5th group, Sept. 1 1, p. m. — 20, 6, 12, 27, 11, 14, 9, 35, 29, 25, 39. Av. of i per 

 19 sec. 



6th group, Sept. 12, a. m.— 3, 39, 37, 26 6, 3, 26, 17, 27, 35, 23, 24, 24. Av. of I 

 per 24 sec. 



