24 



June 12th, 1885. 

 EXHIBITS. 



R. W. Eusby contributed the following lepidoptera, bred from 

 pupae taken at Hambleton, viz. : — Poplar Hawk Moth {Smerintkus 

 populi), Puss Moth {Dicranura vinula), Swallow Prominent Moth 

 {Notodonta dictcea), BufF Ermine Moth {N. suhricipeda), and Swallow-tail 

 Butterfly (Papilio machaon) ; also cocoons of Puss Moth. W. Nelson 

 and W. D. Roebuck showed specimens of Limncea glabra and other 

 shells ; and H. Pollard brought examples of Bulitnus ohscurus and its 

 variety alba ; the latter, of rare occurrence, was taken during the summer 

 of 1879 at Whitby, being the second record for Yorkshire. In the first 

 instance it was found at Grimbald Crag, near Knaresborough, in the year 

 1866. There was thus an interval of thirteen years between the two 

 records. 



G. Paul exhibited specimens of leaf variegation from the several 

 families or genera of begonia, euonymus, fnchsia, gazania, geranium, 

 graminace(B,iresine, laniium, polemonmm, saxifraga,spircea, thymus,veronica, 

 vinca, vilis, and several others. The markings on all these specimens were 

 exquisitely beautiful in colour and shade. The exhibitor described the 

 minute anatomy of leaves, and then put the query — What is the cause of 

 leaf variegation .' This question has never been authoritatively solved ; 

 and is one, therefore, that affords ground for original reseai-ch. It is not 

 the same thing as etiolation, pure and simple, for etiolation is the result of 

 mere exclusion of light, whereas the most brilliant forms of variegation are 

 obtained in strong light ; and, as is well known, perfect light is indis- 

 pensable in the production of chlorophyll — the green colouring matter of 

 plants. There is an apparent contradiction in these two facts, but the 

 exhibitor suggested that the absence of green colouring matter in variegated 

 leaves may be more apparent than real, as the chlorophyll may be 

 attenuated only, and not entirely absent, in those parts of the leaves which 

 are not green ; but further investigation of the question is much needed. 



J. Wood, of Kirkstall, sent a number of not very common flowers, 

 cultivated in the open garden, amongst which were the following : — Phlox 

 pondosa, Pceonia montana, Andromeda tetragona, Linaria alpina, Mertensia 

 paniculata, Lilhospermum prostratum, Veronica Hulkiana, Ranunculus 

 Asiaticus, Iberis (garden var.), Saxifraga McNdbiana, Meconopis camhrtca, 

 Viola puticosa, Ranunculus Cabulicus, Geranium phlceum, Papaver cupri- 

 fragum, Trollius na2)ellifolius, Saxifraga Andrewsii, Trientalis Euro2iCBa 

 Anthericum liliastrimi, Asarum Europium, Dodecatheon media, Papaver 

 Alpinum, Saxifraga marginata, Cypripedium calceolus, Antirrhinum, asaritia, 

 Helianthetnum, and several others. J. E. Bedford exhibited portions 

 of antlers of the red deer, which had been found in the gravel of the Aire- 

 dale valley between Leeds and Kirkstall, at a point about 150 yards from 

 the present bed of the river. The excavation showed two feet of alluvial 

 soil, below which were three or four feet of clay, and underlying this was 



