138 The Kothamsted Grass Experiments. 



there are only four of common occurrence upon the plots ; 

 these are : 



Trifolium repens, L .......... White or Dutch clover. 



Trifolium pratense, L ....... Purple or meadow clover. 



Lotus corniculatus, L ....... Common birdafoot trefoil. 



Lathyrus pratensis, L ....... Yellow or meadow vetchling. 



Of miscellaneous species as many as fifty-nine have been 

 recorded. Below are mentioned those which commonly occur 

 on more than half the plots, and they are arranged in the 

 order of the frequency of their occurrence, each species 

 indicated being more frequently recorded than any of those 

 named after it. The upwards of forty remaining mis- 

 cellaneous species are of decidedly rare and uncertain 



occurrence : 



MISCELLANEOUS SPECIES. 



Rumex Acetosa, L .......... Sorrel. 



Couopodium denudatum, Koch., 



or Bunium flexuosum, With. Earth nut. 



Achillea Millefolium, L ....... Milfoil or yarrow. 



Pimpinella Saxifraga, L ....... Burnet saxifrage. 



Luzula campestris, Willd. Field woodrush. 



Eanunculus acris, L .......... Upright buttercup. 



Ranunculus bulbosus, L ....... Bulbous crowfoot, or buttercup. 



Ranunculus repens, L ....... Creeping buttercup. 



Centaurea nigra, L .......... Black knapweed. 



Cerastium triviale, L ....... Mouse-ear chickweed. 



Galium verum, L .......... Yellow bedstraw or cheese rennet. 



Stellaria graminea, L ....... Lesser stitchwort. 



Plantago lanceolata, L ....... Ribwort, ribgrass, or plantain. 



Veronica chamaedrys, L ....... Germander speedwell. 



Taraxacum officinale, Wigg. . . . Dandelion. 



Carex praecox, Jacq .......... Vernal sedge. 



Heracleum Sphondylium, L. ... Cow-parsnip. 



PLAN OF THE CONTINUOUS EXPERIMENTS ON 

 MEADOW HERBAGE. 



For the sake of comparison, it appears desirable to give a 

 general description of the manuring of each plot, first 

 premising that the different " mineral " or ash constituents 



