294 NATURAL PERIODIC PHENOMENA. 



April 29. Juglans regia (Walnut), fol. 



30. Syringa vulgaris, fl. 

 May 3. Polygala vulgaris, fl. 



— TJlmus montana, (WycJi Elm), fol. 



4. Bdula alba (Birch), fl. 



— Luzula campestris, fl. 



— Anthoxanthum odoratum (Vernal grass), fl. 



— j^ senilis hippocastanum (Horse chestnut), fl. 



— Potentilla anserina, fl. 



— Pedicularis sylvatica, fl. 



— Lotus corniculatus, fl. 



— Viola lactea, fl. 



5. Orange-tipped butterfly, seen. 



— Tormentilla officinalis, fl. 



— Carex dioica, fl. 



— Eleocharis pauciflora, fl. 



— Ajuga reptans (The Bugle), fl. 



6. The Sidft (Cypselus Apus), seen. 



— Arum maculatum, fl. 



■ — Ulmus glabra (Elm), fol. 



— Ahius glutinosa (Alder), fol. 



— Nasturtium officinalis, fl. 



— Cliserophyllum temulentum, fl. 



— Plantago lanceolata, fl. 



7. Fraxinus excelsior (Ash), fol. 



8. Cytisus scoparius (Broom), fl. 



9. Gnaplialium germanicum, fl. 



— Acer pseuclo-platanus {Sycamore), fl. 



10. Pedicularis palustris, fl. 



— Lysimachia nemorum, fl. 



— Erysimum alUaria, fl. 



— Smyrnium olusatrum (The Alexander), fl. 



11. Cytisus laburnum [Laburnum), fl. 



12. Ulmus campestris {The common Elm), fol. 



— Geranium moUe, fl. 



— Cratcegus oxycantha {Hawthorn), fl. 

 14. Anclmsa sempervirens, fl. 



16. Veronica beccabunga (Brook-lime), fl. 



— Cotyledon umbilicus, fl. 



