180 Stapledon.—On the Plant Communities of Farm Land . 
Oats, and Barley), Vetches and ‘Seeds’. It has been pointed out that 
under good farming the communities with roots are meagre, but that certain 
species are usually more luxuriant under roots than when associated with 
other crops. Under poor farming the communities met with in roots and 
cereals do not differ much from each other. c Seeds * have been shown 
to favour characteristic communities, and something definite can be asserted 
as to the growth forms of the generally successful plants ; the nature of the 
community is, however, considerably influenced by success or otherwise 
of the sown seeds. (4) In districts where inferior and unclean seeds 
mixtures are used, the communities not only under the seeds, but in subse- 
quent crops in the rotation, may be influenced to a large extent by the 
added impurities. 
The Faugan, 
Llanbadarn, 
Aberystwyth. 
Literature referred to. 
1 . Armstrong, S. F. : The Botanical and Chemical Composition of the Herbage of Pastures and 
Meadows. Journ. Agr. Science, vol. ii, Part 3, Dec. 1907. 
2 . Bravender, R. J. : On the Indications which are Practical Guides in judging of the Fertility 
or Barrenness of Soil. Journ. Roy. Agr. Soc., vol. v, 1845. 
3 . Brenchley, W. E. : The Weeds of Arable Land in relation to the Soils on which they grow. 
(a) Ann. Bot., vol. xxv, Jan. 1911 ; ( \b ) vol. xxvi, Jan. 1912 ; (c) vol. xxvii, Jan. 1913. 
4 . Buckman, Prof. : On Agricultural Weeds. Journ. Roy. Agr. Soc., vol. xvi, 1855. 
5 . Kinch, E. : Manurial Experiments on Permanent Grass. (See pp. 2 and 3 for Mr. M. Kershaw’s 
Chemical and Mechanical Analyses.) Royal Agr. Coll. Cirencester, Bull. No. 1, 1909. 
6. Moss, C. E. : Vegetation of the Peak District. Camb. Univ. Press, 1913. 
7 . Salter, J. H. : Flowering Plants and Ferns of Aberystwyth and Neighbourhood. Aberystwyth, 
undated. 
8. Smith, W. G. : Raunkiaer’s ‘Life Forms and Statistical Methods’. Journ. Ecology, vol. i, 
No. i, March, 1913. 
9. and Moss, C. E. : Geographical Distribution of Vegetation in Yorkshire. Part I. 
Leeds and Halifax Dist. Geogr. Journ., xxi, 1903. 
10 . Stapledon, R. G. : Notes on the Weed Flora of some Arable Land. Roy. Agr. Coll. 
Cirencester, Bull. No. 2, 1910. 
11. : Pasture Problems: Drought Resistance. Journ. Agr. Science, vol. v, 
Part 2, 1913. 
12 . : The Condition of the Seed Trade in the Aberystwyth College Area. 
Aberystwyth, Feb. 1914. 
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