elementsofphysic017171mbp.pdf

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ELEMENTS
OF
PHYSICAL
BIOLOGY
BT
ALFRED
J.
LOTKA,
M.A.,
D.Sc.
"Voil&
un
homme
qui
a
fait
son
miens
pour
_enniwer
deux
ou
trois
cents
de
ses
concitoyens;
mais
son
intention
6tait
bonne:
il
n'y a
pas
de
quoi
dftniire
PersepolM.
Yoltovre
BALTIMORE
WILLIAMS
&
WLKINS
COMPANY
1925
T
COPTEIQHT
1925
WILLIAMS
&
WILKINS
COMPANY
Made
in
United
States
of
America
v^
Published
February,
1925
ALL
BIGHTS
KESERVIpD
Composed
and
Printed
at
the
WAVERLf
PRESS
BT
THE
VYlLLIAMS
&
WlLKINS
Baltimore,
Md.,
U.
S.
A.
DEDICATED
TO
THE
MEMORY
OF
JOHN
HENBY
POYNTING
PREFACE
The
preface
is
that
part
of
a
book
which
is
written
last,
placed
and
read
least.
As
I
approach
my
concluding
task
I
am
moved
This
question,
if
to
reflect
why
a
preface
should
be
written
at
all.
first,
followed
into
Preface.
all
the
intricacies
of
which
it
apparently
result
in
a
composition
new
in
literature,
holds
potentiality,
should
a
Preface
to
the
Such
precedent
should
not
be
lightly
established,
for
it
suggests
a
vista
of
future
degenerations
after
the
pattern
of
Josiah
Royce's
infinite
succession
of
maps,
each
containing
within
Itself its
own
replica
on
a
reduced
scale.
But
without
going
to
such
lengths
as
this,
the
philosophy
of
the
preface
may
perhaps
briefly
be
sum-
marized
to this
this
is
effect,
that
It
is
the
author's
subjective
introduction
to
the
more
objective
matter
that
should
follow.
Here
he
may,
if
,
deemed
of
any
interest,
say
something
regarding
the
circum-
stances
that
gave
origin
to
the
w-ork,
it
and
the
conditions
under
which
pose,
came
into
being.
He
may
express
his
feelings
as
to
its
alleged
pur-
and
may
follow
custom
by
giving
voice
to
pious
wishes
as
to
the
function
which
the
product
of his
presumptive
mind
may
fulfill
in
an
Universe
in
which
no
event,
however
trivial
be
it
no
more
than
the
addition
of
one
more
book
to
the
groaning
library
shelves
is
with-
out
distant
reverberations.
As
to
origin,
the
first
plan
of
the
work
was
laid
about
1902,
in
the
publications,
of
which
the
first
appeared
in
1907
in
the
American
Journal
of
Science.
Eeference
to
this
and
to
its
various
sequels
will
be
found
in
pertinent
places in
author's
student
days
In
Leipzig.
recorded,
in
outline,
in
various
The
development
of
the
topic
is
The
last
stage
of
the
work,
arrangement
of
the
matter
in
collected
form,
and
filling
in
the
flesh
about
the
skele-
ton
framework
elaborated in
the
journal
literature,
was
carried
out
at
the
Johns
Hopkins
University
upon
the
invitation
of
the
Depart-
the
text
that
follows.
ment
of
Biometry
and
Vital
Statistics.
For
the
courtesies
so
extended
to
him
the
author
wishes
here
to
express
his
thanks,
as
well
as
for
the
interest
shown
in
the
progress
of
the
work
by
Dr.
Raymond
Pearl
and
the
members
of
the
Department,
notably
Drs.
W.
T.
Howard,
L.
J.
Reed
and
J.
R.
Miner.
Outside
the
walls
of

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