THE 



AMERICAN NATURALIST 



Vol. XXVI. February, 1892. 302 



DEVELOPMENT 



selection. If then, t 



ifter a 



certain peri 



od.or-an 



isinsdi.-.- 



would become extii 



ict un 



less means 



: are pro 



vided for 



perpetuation. 



Of certain organ] 





lowever, w 





predicate 



death will occur. < 



)n the< 



•ontrary.fo 



[• the Proi 



o/.oji and ] 



bly Protophyta. (111 



iieellu 





«ms.) it 1 



M ^'r'l! , 



mined by investurai 



■ion tb 



at there is 



no norm; 



•" ' ..' 



and consequently t 



ollowii 



lg, death. 



They a 



re aecordi 



Wcismann, inmior 



tal, « 



, far as 



normal 



death is 



cerned. Xeverthelc 



ss hei 

 Ideatl 



tnu^bet 



•nsidered 



"mdthen, 



S^ 





hich the 1 



Protozoa : 



m-ll^md'l 



x.-t.j.iioiui 



nethcx 



Is are prov 



uled tort 



he reprodi 



1 A lecture delivered De 



cember ) 



l6, 1891, before 



: a meeting , 



>f the Alumni 



ation of the St. Louis Medi 



ca! Colic 



g e - 







