ECOLOGICAL SUCCESSION. 



and two small ponds near it. The younger of the small ponds 

 will IK.- designated as I. and the older one, II. They differ with 

 the exception of the margin vegetation) in much tin- -aim- manner 

 as (In ponds I and ~a of tin- -fries of special -tudy. While Wolf 

 Lake i- in.i -trictly comparable to the other-, ii is ecologically the 

 youngest, I- -cause of its greater area of hare hoi torn. The collec- 

 tions made Sept. 3, 1909) were four j n numher in Wolt" Lake, 

 tour in pond I., two in pond II., one half irom the open water. , m d 

 one hall Irom among vegetation. S-\eral collection- \\ere made 

 Apr. The numbers given are the ,,\, of all collections 



made on t ho-.- dates. They were net collections made in as uni- 

 form a manner as possible. 



TAHI.E XIX 



OWING DIFFERENCES IN NUMBERS OF ENTOMOSTRA< \> 



\viin DIFFERENCES IN I 







I. 



II. 



Septeml 



. 



>cera. 



Total. . . 



1 |KxJa. 

 1 'icera. 



I hi- table -hows the same feature- a- the pnvedii' 

 i) I'll* I irg< r Animals. Little ha- been d"iie in e 

 the relaii\e niimbfr or volume of the lai-er animal- in the dif- 



i p.,nd-. A general idea is given below in Table XX. Phis 



Nl'MBER OF TH! HI 



COLLEl I l< ' 



:- .lur nuiiiily tn -mall iiniiii pods. 



