496 



THE AMERICAN NATURALIST [Vol. LIII 



fail to see the method exemplified. 



Jennings (1906, pp. 246, 247), also, directs attention to 

 this form of behavior in the following words: 



the behavior of otlicr iti vertebrates little mention,"^ it is true, will be 

 found of such movements. This is apparently because attention has 

 been directed by current theories to other features of the behavior, aiul 

 the trial movements have been considered of no consequence. Often an 



mention of various "disordered" movements, turnino-s to one side and 

 the other, and other irregularities, whicli disturb the even tenor of the 



accounts of movomeilts which are clearly of the "trial " cliaractlr.\vet 



T have made a statement about a final goal, but 1 do not 

 intend to cotivey tlie idea, in any way, that these insects 

 are endowed with even the smallest amount of prevision, 

 n<.r (h> r wish to lu- understood a. a-umino- that honm^c 

 nt'ccrtalii pcvcplinii. 0,1 tl,.. pari oflli." xvat.T Miitlci^. of 



Ihr rxiuclici.- ol t 1 1 ^r. 1 1 1 . .V tlh'K.h.lV IV^lHUMlrd W i t 1 1 



a S'<'<'i;«l form <.r hdiaM-.r Hiilal-lr \n inr.\ \Ur .litliciilt i.- 

 of the <it]iati(.n. r.ut. ..11 Ih.. n\Ury liaiid. I wi^li In pi'.-rnt 

 the tlM.nulit thai tln-M- u-nhU. i„ wn^\n'^ auax t'm,,, ih.ir 

 foniuM- ha.n.t^. .,.a> or n.a> .mt ,1,,.,,, annth.r ho.l> 



of water, it' tliere is one in the vidaitv. and that thi^ hap- 



