Vol. XXI. July, /p//. No. 2. 



BIOLOGICAL BULLETIN 



I. TRUSTE1 - 



AL'GL'ST. 1910 

 . OFFICIO 



i-. 1\ 1. 11 i i, . /':/, ctor LJnivei ;ty of Chic:. 

 (in MAN \ I IKI \\ nit I'ircctor, Vniver-itv <>f Maine. 



I ). l!i. \KKIY HiiAK 1 . Treasurer, n>i 1 >r\i>nsln're Street, Boston. M 

 TIIM-. ||. M..- ,;v. JR.. C/c-rfc o/ //it- C> r/'.'/-<i// 1 /. University of 



I ' inisylvania. 



XT 1 1. ]<JI4 



E. G CON KI IN .......... l'rinrrt"i] I'niver-ity. 



I I \K'I N aK- I'liiver-ity. 



KIMUKK. . . . j- \\ illiam Strn-t. \\ w ^"ork City. 



M. M. Mi ........ ' '!., rlin Co!' 'ln-rlin. < >!: 



\\'IIII\M I'VIIKN ........ I 'artinouth ' . HaiMver. \t-\\ Hani|)- 



shire. 

 i\ M CLAP? ..... Mount Holyokr -nli I la'lIi-y.Mass. 



I M MI; Ri i(,ii \KII ......... CniviT>ity of Micliiijan, Ann Arlior. Mich. 



\\'. I 1 .. S<MM ............ I'riiu-i-toii L'niver^ity. 



\ i n. 

 \\III\MM L. I'.KII heeatur Avenue, Bronx. Xe\v York 



y- 



S !'. ('I\KKK ........... William- William-town. Mass. 



CHARLES I ..... [DGI ....... \me- Buililint;; Bo-t<'ii. Mass. 



i . R. ( K\NI ............ 2559 Mirhi^aii I'loulevard. Chicago, 111., 



TreMilent of the Boanl. 

 A i i KI -n i '. M AVKK ....... ( 'an; uie Institution. \\"n.hin^ton, I). C. 



T. II. MMK.;A\ .......... Columbia University. 



l'k\\i\ !". SMITH ........ l'nite-1 States Department of Agriculture, 



\\'a>hiii!4ton, D. C. 

 I . I'.. \\'n -o\ ........... Cohnnhia I'nivcrsity. 



73 



