10 52 Proceedings of the Royal Irish Academy. 



No. 12. '■ P " mixture. — Satisfactory sample ; purity about 99 per cent. 

 Panicum dichotomum and Eudbeckia snow that some of tbe mixture is of 

 North American origin. Oenothera is not generally found as an impurity. 

 Alyssum calycinum. Plant-ago ?Eugelii. 



Anthemis Cotula. Poa sp. 



N Carex ?ovalis. Potentilla sp. 



N Chrysanthemum Leucanthe- Eudbeckia ?hirta. 



mum. N Eumex Acetosella. 



Lychnis vespertina. Scrophularia ?vernalis. 



Oenothera sp. * Sisymbrium ?officinale. 



Panicum dichotomum. * Stellaria media. 



N Plantago lanceolata. Verbena sp. 



Xo. 13. "T" mixture. — Satisfactory sample: purity about 99 per cent. 

 Cynodon Dactylon, Euphorbia Preslii, and Oenothera are unusual impurities. 

 The second, with Plantago Rugelii (if correct), indicates a North American 

 ingredient. 



N Chrysanthemum Leucanthe- Oenothera sp. 



mum. N Plantago lanceolata. 



Cynodon Dactylon. (P. Eugelii or 



Euphorbia Preslii. /P. media. 



N Hypochaeris radicata. Potentilla sp. 



* Lapsana communis. N Prunella vulgaris. 



X Leontodon autumnalis. N Eumex Acetosella. 



Lycopus europaeus. N Eleocharis palustris. 



Samples 14, 15, 16, 17, 18, and 19 are reported as being practically pure. 

 This set of samples shows a change both in the nature and in the amount 

 of the introduced weed-seeds as compared with the Achill Sound set. 

 Although the hist of species occurring in the samples which are absent 

 from Clare Island is still large — 14 as against 20 in the Achill samples — 

 their quantity is much reduced, the total impurities averaging only about 

 ■3 per cent. The species found in this batch of samples which do not grow 

 on Clare Island are 



Alyssum calycinum. Verbena sp. 



Lychnis vespertina. (Plantago Bugelii or 



Silene Cucubalus. |P. media. 



Oenothera sp. Amaranthus sp. 



Anthemis Cotula. Euphorbia Preslii. 



Eudbeckia ?hirta. Cynodon Dactylon. 



Scrophularia ?vernalis. Panicum dichotomum. 



Lycopus europaeus. 

 The most striking feature in these lists is the North American ingredient 



