TNVICSTKJATION OK 1-1 1' 



II ISroKV 



31 



of the |)a[)('r coniicclcd wi( li t lie reels, and the edi^es were bent ii[)\Viir(l 

 ill such a manner as lo prevent the escape of (he hii^a IVoiii (ho sides 

 of the tahh>. The ])ai)er on the reels consisted of ordinary wrapping 

 paper IS inches in wicHli. The larva was placed in the center of the 

 table and the record of its travels was made wilh a lead jxMicil. The 

 experiment was hei^un at S.30 a. m., June IS, 1<)1(), and was conducted 

 by Mr. ('► W. Collins, witli the assistance from time to time of various 



• v ' 1 .i i 





Fig. 14. — Method of securing 'lata on the distance traveled by larvreof Calosoina si/mplmnta. (Original.) 



members of the laboratory force. It was necessary to carry on this 

 experiment continuously until the larva died, and as it remained 

 active for 72 hours shifts of men were used so that there was no })rcak 

 in the record. The larva traveled ftir more rapidly tlian was expected 

 and it became necessary from time to time to substitute a fresh roll of 

 paper in place of the one containing the record. In all 1 1 rolls were 

 used and careful measurements indicate that during its life the larva 



