274 IV ciinfkukm;!'; i.\tkiinatiiin\i.I'; w. (;KM':Tini'i';. 



bpginning ol' liis ciui"!'!-. lo soinc cxlriil ('\[)laitis liis ;issiiin|)lioii lli;it iillirr races 

 l)('li;tv(> in a siiiiilar nianiicr. 



lu Hic Iriii' " peliU'S espèces ", ail llie profjeny of an individual resemljle 

 cacli ollicr wlicii grown in Ihc same conciliions, but in llie geograpliical types 

 nnder considération, cei'lains characlers only are fixed. The case of (ienista 

 hnrrida of Coiizon (Rlu'ine) renanied G. liigdunendi by Jordan, is su(di a type; 

 six forms of this Brooni were found growing near logetiier at Couzon, and llieir 

 seeds were sown. but in no case was llie original forni reproduced in llie progeny. 



An inleresting exani]de ofa cliniatic adaptation is found in Orcltis ruhra. of 

 wliicli plants froni Algcria, C.orsica, and Ain, were grown in pots, and wintered 

 in frames. Although cuitivatcd under similar conditions, thèse Orchids con- 

 tinue to flower at diflerent periods, tliose froni Algeria ai the end of March, 

 those from (lorsica at the end of April, and those froni Ain al tiie end of May. 

 Unforlunately no seed has been oblained from tliem. 



\n Nnrrissim pseiido-Narcissux, an carly foriii from Mont Cindre, and a laler 

 form from Mont Pilat hâve maintained their dilTerent llowering periods. noi 

 only when propagaled vegetatively but aiso wlien raised from seed. 



An extensive study lias been made of the genus Scmpcrviviiin, in wlii<li 

 hybrids and sub-species abound. Tiie most widely distributed species, .S. Icclu- 

 ruiii, bas been separated into several sulispecies, and nearly ail otlier forms of 

 Seiuj)i')i'ii'i/iii arc variclics. or hybrids, of thèse subspecies, crossed willi 

 ■S. arai-ltnoidruiii or Diniiiinuim. Six distinct forms hâve been oblained from 

 seeds of .S. calrareuin, and twelve forms from seeds of S', arverncnse. An inle- 

 resting variation found in many Linnœan species is the increased hardiness of 

 certain types. An example of this is found in Scil/iin altis^imum, of which species 

 plants were oblained from France, Italy andSpain. Duringa very cold winter, 

 a large number of the plants were killed, and il was fountl tliat only those thaï 

 came from the colder parts of France had survived. 



Enough lias been said lo show Uiat the races (forms, varieties, and petites 

 " espèces " which compose a Linnœan type, do not in ail cases possess fixed 

 characlers; thaï in the case of perennial and shrubby plants Ihey seldom breed 

 true, although in animal species, the greal majority of such forms reproducc 

 themselves by seed. 



