OBSEKVED IN HERTFORDSHIEE IN 1881. 79 



Hy p'ouping; these 48 species into two sets of 24 each, the 

 character of the spring and summer seasons may be indicated. This 

 is shown in the diagram by the single round dot. Vegetation is 

 thus shown to have been in 1876 backward in both spring and 

 summer; in 1877 forward in spring and backward in summer; in 

 1878 forward in both spring and summer; in 1879 backward in 

 both spring and summer, especially so in spring; in 1880 forward 

 in both spring and summer; and in 1881 about the mean in spring 

 and forward in summer. 



The following are the species from the observation of which 

 these results have been derived : — 



For February (Jan. 27 to Mar. 13). 



70. Galanthis nivalis. 2. Ranunculus Ficaria. 

 9. Viola odorata. 64. Uhnus montana. 



37. Tussilacfo Farfara. 69. Karcissus Pseudo-narcissus. 

 63. Jlercurialis perennis. 25. Potentilla Fragariastruin. 



For March (Mar. 14 to Apl. 15). 

 1. Anemone nemorosa. 57. Nepeta Glechoma. 



61. Primula veris. 12. Stellar ia Holostea. 



4. Caltha palustris. 30. Anlhriscus sylvestris. 



22. Prunus spinosa. 7. Cardamine pratensis. 



For April (Apl. 16 to May 8). 



71. Fndymion nutans. 16. Geranium Eohertianiim. 



62. Plantago lanceolata. 20. Vicia sepium. 

 3. Ranunculus acris. 60. Ajuga reptans. 



52. Veronica Chammhys. 10. Polygala vulgaris. 



For May (May 9 to June 1). 



32. Galium Aparine. 39. Chrysanthemum Leucanthe- 



24. Potentilla anserina. 18. Lotus cornidulatus. \_miim. 

 17. Trifolium repens. 5. Papaver Rhceas. 



46. Hieracium Pilosella. 11. Lychnis Flos-cuculi. 



For June (June 2 to 19). 



68. //•?« Pseudacorus. 13. Malva sylvestris. 



21. Lathyrus prafensis. 59. Stachys sylvatica. 



67. Orchis maculata. 55. Thymus Serpyllum. 



26. Rosa canina. 28. Epilobium montanum. 



For July (June 20 to July 13). 



44. Car dims arvensis. 19. Vicia Cracca. 



23. Spircca JJlmaria. 33. Galium vermn. 

 42. Centaurea nigra. 41. Senecio Jacohcea. 



38. Achillea Millefolium. 47. Campanula rotundifolia. 



During the period of our register these species, as is indicated 

 above, have not all opened their flowers, on the average, within 

 the month for which they are selected, for, in order to derive the 

 several means from equal numbers of observations, by which alone 

 truly comparable results can be attained, it has been necessary to 

 utilise observations the mean dates of which extend over some- 

 what irregular periods. 



