The Biological Problem of To-day

le, constantly

ents on transfus

on immor

heteromor

ity of ani

ments on sex o

ation of sex by

ayered multicellular animals; a third set of cells, the m

n of, to division

heory of

general protopl

body is composed of many cells, specialized

on grafting among

a group of low organisms, consisting of creep

iological

tion and grafti

dity

t in devel

city of p

characters o

generati

tion of, from un

ls, different in chemical and physical properties (see

s on origin of

luence of, on

bone-gra

ent of an individual f

h are the active agents

rmation of egg-cel

e sexual cells were composed of minute particles (ge

cellular sheat

ncer's name for hypothetical ult

luence of temp

, mode of g

ame for theoretical u

plant tissues,

larval stage in the devel

reproduct

same species in several different fo

transfusion

with the original meanin

ganism that grows from the spore of

protoplasm beyond the gener

a group of p

n plants and a

rafted on O

tween epigenesis

theory

dimentary organs in adult creatures were for the most part vestiges of organs that had lost their use. In this treatise 'rudiment' is applied to an or

rudimen

on cell

n and prot

, reproduction

bone-graf

arly division of a

rom the early divisions of a developing egg

cavity. See

on of, by temper

, the nucleated pieces of protoplasm which are the starting-po

l as contrasted with the reproduct

cells of the soma

ersy with Weismann on pol

formation of spermato

ous gene

connecting the individual

lue of the nucleus

polymorphi

ion of b

ation of b

grafting o

experiments on the e

erimental hete

arine animals clad wit

plants (protophyta) with the simplest structur

doublin

tion of a bi