tCOLOGICAL SUCCESSION. II 



In general, animal ecology is concerned with the relation of 

 animals to their environments. Theirs/ essential is to locate the 

 animal in its environment. 



Our inquiry and the paper- which will deal with the results 

 have <vnu-rrd around the following purposes: 



1. To determine the animal activity which takes place within 

 the narrowest limit- .md which is most important to the specie-, 

 with a view to locating motile animals in their environment-. 



2. To determine the phi-m.niena in animals which correspond 

 to gro\\ tli-form in plant-. < '.ro\vth-form in plants is usually a 

 convenient index of the phy-iolo-ical condition- \\ithin. 



3. To determine the validity logical >ucce--ion a- applied 



to animal-. 



4. To determine thr v.ilu.- of the principles of physiography 

 and plant ecolo : _ . nimals in their environments, 



in determining -"iiiethin'c of tin- ph\ -iolo^ical character of 

 the or-.ini-m .1- a uh.l.-. .md in the an.tl\-i- of the or^ani-m 



5. To inquire into tin pi . ib ilit y of or^ani/in^ a -\-tem of 

 ecological i la ilication for animal- \\hich -hall lie sufficiently 

 independent of the Oth( 'i in- and method-, to f. >rm a b.i-i- 



for generalization which m.t\ serve as a check on the results oi 



tin- held- of evolution, heredity, and phy-iol, 



I o inquire int" the relation -t succession to the quantitative 



pro), Inn- ot l.iol. ,-\ . 



7. lo in.|iiiiv into tin- relation of succession t> the origin of 

 adaptation-. 



,s. To inquire into the relation- . . to tlu- economic 



piol.lein- of zodlogy, and the po il.Hity of u-ini; ecolo-\ as a 

 means of lirin^iiu aliout a I'dter uniticalion ot the \ari<ui> 

 hranche- of / . pure and applied. 



It ha- 1-eeii found impracticalili- to organize the \\.rk SO that 

 one pajier \\ill deal \\ith the >ul>jcct of an>' one of the al>o\e 

 pro|>o-itioii- alone. The di-cu ion of physiological animal 

 ;ih\- in the \\'hitman Memorial X'olume of the Journal <>J 

 Morphology i- intended to serve a- an introduction to the -eiu-ral 

 qtie-tioii-, .md de.il- niainlx with the fir-t t\vo and the tilth 

 purposes. I'lu- pre-eiit ]t.qier. \\hich i- intended to be the tir-t 

 of a series "f ti\e or -i\. i- concerned \\ith the (|Ue-lion ot the 



