58 GEOGEAPHICAL DISTEIBUTION.
Sea to the nortli-west and the barrier of an inclement mountain chain on the south-east,
the path of immigration into this province was comparatively narrow, and accommodated
comparatively few species. Then, during the period oi stability that followed, the
natural conditions that made the shores of the Mediterranean Ocean a centre of preservation
for the present flora of the Mediterranean basin, prevented the wide extension
of such species as had gained access to the arctic and sub-arctic portions of the
province. And finally, when retreat began, temperate conditions were early established
on the territory through which these invading forms had reached the Caucasus. Their
retreat being thus cut ofi, they could only extend in the Alpine parts of the Caucasus
province itself. But as their advance had been greatly checked, the forms thus cut ofi
were few in number, and in place of finding the area subject to natural conditions
suitable for their existence steadily curtailed, they found it continue ample. Internal
pressure thus being minimised, and there being practically no external pressure, there
was little sthnulus in this province, compared with any other, to variation at all,
such variations as naturally appeared deviating far less than variations elsewhere did
from the original archaic types.^
Fr.„.t,t(«= . t e l ^ 1. foot-not. 12) l . v . bo.a puHitbrf Fort., md
t»PO» .d • o " ,.b...otto„ StrW. m . l b. oon.id.t.d m.r.lj t.nl.tlvo.-36. P. tntosrifol,.
Ml do.onpt.oa t t d ' t a y t r ^ ^ F....1.... Tbi. n » . » propo.od tor . pUb. ta.. tb.t
JJOOJ,. /. .. OO. „ " p rail A. Mr. Ifaimowioi b.. boon .bl. (o(. M,l. Bi.l. " ' . ¿ r . : " ^ " . — r C o « .a„,t. tb.... b„ 00.. ..0..
S S I l " -d ..«.d (i. llort. P.„. ) b, ,1. 1... M,. B. . tb.„, tb. P « „ . . d .. not . p,..ont . . „ p .bK Tbo,.
M. " ^ „ Tuomo pl..t from tk. Sikkioi lom of P. (pl.t. 20, B) w.lb flo.h,
1 " - tbi. s i i » S i t t , ooLol, .0. . P . .MT di.ti.0. f,o.n tb. t.u. P. o. the H..W. H1. .1. , . . «
m i ; ; » il .I.tit.t.d fo, P. „ .Lpr r i fol i . P , . » « {M.I. mol. lU, 89S , 1888. wh..b k . . p™».,. Bo 1. p.b ...t.o.
t ,, p.„t p.. ^A. B . C . d . ZoU. 6« » d M. Er.o.h.t i. r..p.«..bl., .f ..,nt.n..on.II,
„ t . n / « l q o . .»l..»o.p.»tp. • > ; „ „ ,.d from SioaA™.-?!. P. S^mmion » . M
7 nTw":.;;. ^ — " " ""»r
U not g.™n m th. d..or,pt,on. 88 P vaSaES A ¿» „ „ . i . A .till mor. ml.r..ling .ow .pod..
. . . „ a o o t t b . " di.propo„ioa.t.lj „.11 lip, wi.b
" » i T r J i . . ~ P' » " « oWotoribitborto l.o,aonl,in .. d b.
o o n n f i n L b, tb. o c o ™ . of P. »«^iToi» » Ynnn.a . . w.ll . . .a Cl.n»b..
PART n.-SYSTEMATIC AKKANGEMENT OF THE
INDIAN SPECIES.
Ann. Eoy. Box. Gabd, Calcutta, "Yoi-. III.