The Gramineous Heritage. 137 



kind of manure induces a struggle which leads to a 

 diminution of the number of species down to twenty, or even 

 fewer, though it must not be overlooked that such diminution 

 of specific forms may be quite compatible with an increase 

 in the total yield of herbage. The subjoined details 

 concerning the botanical composition of the herbage are 

 derived from " Part II. The Botanical Eesults " (" Philo- 

 sophical Transactions," 1882), further information respecting 

 which is given at the end of this volume. 



Of Gramineae the following twenty species have been 

 identified upon the plots : 



GRAMINE.E. 



1. Anth.oxanth.um odoratum, L. Sweet scented vernal grass. 



2. Alopecurus pratensis, L. ... Meadow foxtail. 



3. Agrostis vulgaris, With. ... Creeping-rooted bent grass. 



4. Holcus lanatus, L Yorkshire fog. 



5. Avena elatior, L., or Arrhena- 



therum avenaceum, Beauv. False oat grass. 



6. Avena pubescens, L Downy oat grass. 



7. Avena flavescens, L Yellow oat grass. 



8. Poa pratensis, L Smooth-stalked meadow grass. 



9. Poa trivialis, L Bough -stalked meadow grass. 



10. Dactylis glomerata, L Bough cocksfoot. 



11. Festuca ovina Sheep's fescue. 



12. Lolium perenne, L Common rye grass. 



13. Briza media, L Common quaking grass. 



14. Cynosurus cristatus, L. ... Dogstail. 



15. Festuca pratensis, Huds. ... Meadow fescue. 



16. Bromus mollis, L Soft brome. 



17. Phleum pratense, L Timothy grass. 



18. Aira caespitosa, L Tufted hair grass. 



19. Festuca elatior, L Tall fescue. 



20. Festuca loliacea, Huds. ... Eye-leaved fescue. 



Of the foregoing species the first twelve are of common 

 occurrence upon all the plots. Nos. 13, 14, 15, 16, though 

 very general, do not invariably occur upon each plot. Nos. 

 17 and 18 do not appear upon one-half, and in some years not 

 one-fourth, of the plots. The last two species are extremely rare. 



Of Leguminosse, whilst ten species have been identified, 



