OX THE BEHAVIOR or TUHK < >!.< >l - ANNELIDS. O.} 



int.il of animal economy and behavior. To ivco-ni/e them 

 as facts is not to imply thereby their explanation; but it does 

 imply that they are no less entitled to recognition ami cxplana- 

 t if in than any other classes of facts with which we have to deal. 

 I i~ an- sometimes characterized as "stubborn thins;-." they 

 ha\e ways of their own; they are tenacious fit" lilV; and -o<mcr or 

 later \\ill compel respectful attention and explanation. A- i- 

 well known, in his matchless account of the behavior ot earth- 

 \\onn- I'aruin <lid not hesitate to employ a terminology which 

 iiankK a->umed the presence in these creatures of nervou- and 

 p-\rlii( factors. While it may not be easy to pm\e that anne- 

 lid- ha\e a high degree of intelligence, on the other hand In \\lio 



lys to prove that intelligence has no part whatever in their 

 beh.ixior \\ill hardly ha\ r e an easier problem. 



\t no time has the writer questioned the important relation-, 

 ol ph\ -i .- hemieal factors to the phenomena of lit* .md beha\ i'r. 

 1 in tin i. hr has not questioned the possibility of the correla- 

 tion ot these phenomena under physical laics, mm h as ue n > 

 ni/e that |ihenomena of electricity and magneti-m and -ra\ i- 

 i.iiion .in conserved under other natural laws. Hut tin- b\ 

 n.. mean- implies that these latter species of ener-\ h.i\e n-.i 

 i IK i o\\n ''fcial lau's, some of which are alread\ kno\\n \\hile 

 other- ha\e thus far defied definition and correlation, ^o. in 

 tlie in. nter under review, what he lias <|iie-tioiud i- the very 

 dillei.nt po-iilate, that knou'n properties of ch<-mi-ir\ of phy-ie- 

 in an\ ot their known interactions afford a<le(|ii.ite definition 

 and explanation of all the facts; or that kn:cn f>liysi,dl I: 



ipplied b\ the sponsors of mechani-m, an- convincingl) 

 -iiiiuieiu. It is against the arrogant a>-umpiion that a i 

 ol" beha\ior. . .r an expression of emotion or atle. tion. i- never 

 explaiiu-il till cast into some physical or mathematical tormnla, 

 that prote-t ha- been iterated. In dire* -tin- attention to the 

 po^-ible interaction of well-known p-ychic factors in belia\ ior 

 tlu re i- merely the plea that similar re< -^nitif >n be -i\ en to them 



to the lornier and, as suggested above, they be included in 

 the category of behavior calling for explanation. Ho\\e\.-r 

 independent or unrelated may appear certain of their expressions 

 it i- not a--uined that in any scientific sen-e they are mutually 



