,
VARIATION AND DÏFFERENTIATIQN ' 1935
to,yield only a particular character or*“‘right
line
”
without
but that only proves that under
natural conditions the ,germplaSm is very plastic; ,It does
not prove that
“
right lines ”, exist in, nature in _SuCh Complex
bodies as the shes.
,
_
—t
-
Accordingto this View,
mixing of
,
'
plasms (amphimixis) accounts for'the variati0nsmen‘cmned,
but we have to draw poWer£ully on_'our1magrnaüonto picture
'
j ,_
the'pr‘esehœ: of —a=numbef of right lines
:_
'theCase of ZoarceS, the Viviparoùs Bleny,väihose variations À
,
have been closelÿ studied and described in a remarkable
'
,
series of papers by]ohs
the immber,Of vettèbrätæ
variés
and
havé'to'
that
_
:might represef'
'
'
gethypés; Hence
has a posSible chance of —
26, and these should all be represented in the inherited;
'
substance.
all other characters, the number of n—raÿs,
'
‘
size of head, etc., are almost as variable, and each:germ
_
_
should_thus potentially have themaldhgs of somemhons
'
Of
We may,»doubt Whetherzthelçgètmlsreally
'
’
;
,
axid‘ithe mere:ebi‘tmuco‘cejiÿefwhai… :
'
»
f1tmeansrewndsionle the-bld riddläe of the soh@01men——'
_
hwmyg1tdptfdl
.
,
;.
,
Thegenotypexsanabstracuon whæhhas fàr»iS,efaa_a.;1ikejthé »
_
deterrhihants, idS, etc,',g,‘fromj anendeäV0urt0trace theshaïe
_
of the paretsi the
,—
_
mode of development Of the vertebIæ
,fÏI’È means
’
an isolation of the characters from“one another]and from
'
j '
the organism as a whole, preciselÿ the reverse of Heineke’s
"
'
method.. The vertebræ are taken by themselves as if they
—
the consequences appear, when ]ohs,
Ÿ
,
_
,
-
Schmidt calls
“
race
”
merely a statistical unit, whereas
_
forwas a biological
,ThefoImer maybe
-
'
”denéd by fe£cŒnïœ;to particular
,“
’,;1æœf, eludes—fäéætËi0nâust—Îa‘s: muchasthespeaesœeven
':
yetweknewmsthere ;—îgî; -
—
_
».
…
:
Inlnsstud1esonZoarceslohsSchmdthasn0ttakenthe