272 A STUDY OF THE SURVIVAL OF THE FITTEST. 
according to their power ofsurvival under the conditions as explained, 
Pp 
grow so as to fill up their property “eh faialy, but do nae teal 
and, thirdly, those that, unless they were renewed, would soon die 
out and disappear. The foreman, Mr. Dewar, who has had charge 
of the collection since it was started, has looked over my lists and 
suggested a few alterations. I need not of course point out that 
the struggle for existence nde the conditions as just explained is 
something quite different from, and very much less intense than, it 
would have been if the same aaioios had been ra arian upon 
when grown mixed up together indiscriminately. It is very likely 
that many of the species placed in the category of those that have 
held their ground have not been reproduced from seed at all, but 
have simply multiplied from the original stock by mere vegetable 
reproduction. But of course to keep a record of a struggle for life 
in which a great many species were concerned, carried on under 
perfectly natural circumstances, would be a very difficult matter. 
Crass A. Species that have shewn a distinct tendency to spread over 
the walks and take possession of the plots of ground that belong to 
_ their neighbours. 
Annuals and Biennials.— Ranunculus arvensis, R. lanatocarpus, 
Papaver Rhoas, P. somniferum, Eschscholtzia californica, Glaucium 
luteum, Chelidonium mee Fumaria officinalis, ep ium sativum, 
Capsella Bursa-pastoris, Koniga m , Iberis amara, Reseda 
lutea, R. Luteola, R. iekaulben. Viela ‘telonlor: Sparvula arvensis, . 
Silene Armeria, Lychnis Githago, Claytonia perfoliata, C. alsinoides, 
Geranium rotundifolium, Tropeolum majus, Malva rotundifolia, 
M. crispa, Impatiens pairilioek 1 . glanduligera, (Enothera biennis, 
Anthriscus Cerefolium, Digitalis purpurea, Collomia grandiflora, 
Atriplex hortensis, Euphorbia exigua, Bromus maximus, B. madri- 
tensis, Festuca pseudo-myurus. Perennials.—Aquilegia vulgaris, 
Lychnis Coronaria, Hypericum perforatum, Tellima grandiflora, 
Epilobium squeitom:, E. hirsutum, E. parviflorum, EK. 
montanum, E. obscu yrrhis odorata, Foniculum vulgare, 
Pastinaca ven _Ligustio ain alatum, Dipsacus Pullonuti, Artemisia 
oS nthemum Leucanthemum, Taraxacum officinale, 
ossum officinale, Convolvulus arvensis, 
Lysinackin ace Plantago major, P. lanceolata.—59 species. 
Crass B. Species that have held their grownd but do not spread. 
Clematis recta, C. tubulosa, a Jacquinianum, T. 
glaucum elatum, Aconitum Napellus, 
Peonia officinalis, Papaver pilosum, Dicentra spectabilis, Arabis 
alpina, Cheiranthus Cheiri, Cardamine asarifolia, Brassica oleracea, 
Sisymbrium orig or m, Erysimum virgatum, —— officinalis, 
Iberis Garr , Aubrietia delteicien: Alyssum saxatile, Helian- 
themum eg Dianthus barbatus, D. plumarius, rec ie chal- 
