126 NATURAL PERIODIC PHENOMENA. 



April 11. Laburnum, Cytisus Laburnum, fol. 

 15. Swalloiv, (Hirundo rustica), arrives. 

 18. Lady's-smock, (Cardamine pratensis), fl. 



— Luzula campestris, fl. 



20. Wycli elm, (Ulmus montana), fol. 



22. Oak, (Quercus sessiflorus), fol. 



— Plantago media, fl. 



— Horse-chesmtt, (CEsculus hippocastanum), fl. 



23. Grasshopper warbler, (Sylvia locustella), heard. 



24. Cuckoo, (Cuculus canorus), heard. 



— Bugle, (Ajuga reptans), fl. 



— Tormentil, (Tormentilla officinalis), fl. 



— Milkwort, (Polygala vulgaris), fl. 



27. Woodruff', fAsperida odorata), fl. 



28. Laburnum, Cytisus laburnum, fl. 



29. Ash, Fraxinus excelsior, fol. 



30. Bird's-foot trefoil, (Lotus corniculatus), fl. 



— Corncrake, (Crex pratensis), heard. 



May 1. Salmon-Peal, (Salmo Trutta), ascends the Camel Eiver. 



— Yellow Loosestrife, (Lysimachia 7iemoruvi), fl. 



— Hawthorn, (Cratoegus oxycantha), fl. 



2. Mountain Ash, (Sorhus aucuparius), fl. 

 7. Martin, Hirundo urbica, arrives. 



— Columbine, (Aquilegia vulgaris), fl. 

 9. Pimpernel, (Anagallis arvensis), fl. 



10. Tufted Vetch, (Vicia cracca), fl. 



— Elder, (Sambticus nigra), fl. 



11. Foxglove, (Digitalis purpurea), fl. 



— Yellow rattle, (Ehinanthus Crista-galli), fl. 



— Silver weed, (Potentilla anserina), fl. 

 . 17. Sanicle, (Sanicula Europoea), fl. 



18. Hypericum pulchrum, fl. 

 21. Dog-rose, (Eosa canina), fl. 



25. Stellaria graminea, fl. 



— Honeystickle, (Lonicera Periclymenum), fl. 



— Horsedaisy, (Chrysanthemum leucanthemum), fl. 



— Bladder, (Silene inflata), fl. 



26. Guelder-rose, (Viburnum optdus), fl. 

 ■ — Blackberry, (Eubus fruticosus), fl. 



