118 THE JOURNAL OF BOTANY 



1. Farringdon Street. 4. Eussell Street, Covent Gar- 



2. British Museum, Blooms- den. 



bury. 5. St. John's Street, Clerken- 



3. Upper Thames Street. well. 



1. The Farringdon Street Site. 



An account of the plants found upon this site appeared in the 

 Selborne Magazine, Oct. 10th, 1910. It will, however, be well to 

 recapitulate the facts stated in that magazine which bear upon 

 the present investigation. 



This site had been cleared about two years, but no fewer than 

 twenty-eight species of seed plants and ferns, two mosses, and 

 one liverwort were observed upon it. It covered an area of about 

 half an acre, and was formerly occupied by the works of Messrs. 

 Harrild and Sons. 



Wind-distrihitted Plants. 



The plants of this group were probably carried to the site by 

 the wind. It will be noticed that the groups of wind-distributed 

 plants found upon all the sites were remarkably uniform in 

 character. Further reference to these wind-distributed plants will 

 be made in the concluding remarks. 

 Epilobmm angustifolium L. 2, S. Jacohcea L. 2. 



3, 4, 5. Cardims arvensis Eobson. 2, 



E. roseum Schreb. 4, 5. 3, 4. 



Tussilago Far far a Ij. 2,3,4,5. Taraxamtin officinale 'SVebev. 3, 

 Erigeron canadensis L. 2, 3, 4. 5. 

 Senecio viscosus L. 2. Salix {cajorea ?). 3, 4. 



Small-seeded Plants. 

 The plants included in this group are those which, when 

 judged by their habit of growth and their small seeds, have 

 probably been distributed by adhering to the feet of birds, or have 

 passed through the digestive organs of birds uninjured. Such 

 plants are sometimes distributed by ants, which carry them off 

 to their nests, or they are washed about by the rains. Neither of 

 the latter methods would, however, account for their presence in 

 the centre of a large town. The fact that these plants were only 

 found upon the larger sites, and upon the Upper Thames Street 

 site, would lead us to infer that smaller building-sites are apt to 

 be overlooked by birds. 



Capsella Bursa-pastoris Medikus. 2, 5. 



Stellaria media Villars. 2, 5. 



Forage or Packing Plants. 

 In the article in the Selhorne Magazine the suggestion was 

 made that the main source of this class of plants found upon this 

 site was the rough stuff used for packing machinery, formerly 

 used in the works which occupied the site, and that forage con- 

 tributed to the collection. The fact since observed that only the 

 larger sites have long lists of this class of plants, and observations 



