174 EXPERIMENTAL EVOLUTION LECT. 



investigations. Among these 247 species there are 

 seven which are rapidly becoming extinct. 1 We thus see 



1 The following is De Candolle's list : 



I. Species spontaneously growing in the wild state, with all 

 the appearance of indigenous species, and identical with 



the cultivated species 1 69 



Of these 169 species 31 are of very remote origin ; 56 

 have been cultivated for more than 2000 years ; the others 

 are of unknown date. 



II. Species of the same category as I., but which have been 

 found in a wild condition in one locality only, and only by 



one observer 3 



Cucurbita maxima. Faba vulgaris. Nicotiana tabacum.^ 



III. Species seen and noticed, but not gathered, by non- 

 botanical observers who may have been mistaken (old 

 authors) 2 



Carthamus tinctorius, Triticum milgare, 



IV. Species found in a wild state, by botanists, under forms 

 which differ slightly from those which are cultivated, but 

 not enough to prevent most botanists from recognising 

 that both are of the same species 4 



Olea europea, Oryza saliva, Solanum tuberosum, Vitis vinifera. 

 V. Species found in a wild state, but considered by some 

 authors of different species, by others, of different variety, 



when compared to the cultivated forms... 15 



Allium ampeloprasum porrum, Cichorium endivia 

 var.*, Crocus sativus var., Cucumis melo*, Cucurbita 

 pepo, Helianthus tuberosus, Lactuca scariola sativa, 

 Linuni usitatissimum anmuim, Lycopersicum esculen- 

 tum, Papaver somniferum, Pyrus nivalis var., Ribes 

 Grossularia*, Solanum melongena, Spinacia oleracea var. *, 

 Triticum monococcum. 



1 Italicised names are those of species which have been cultivated for 

 a very long time ; names with an * are those of plants cultivated 

 for less than 2000 years. 



