46 Mr. J. Hogg and Sig. Tenore on the comparative Influence 



the most important accession which we can look for of the fields 

 already worked. 



North Welsh and Shropshire Coalfields. — The memoirs of 

 Mr. Murchison promise to afford important additional in- 

 formation concerning these districts. I have already in this 

 communication indicated their probable eastern extension, viz. 

 of the Flintshire coal-field to join that of Lancashire; and of 

 the Shropshire fields, near Bridgenorth and Over Arley, to 

 join that of Dudley. With regard to the north-western coal- 

 fields, as we approach the Cumbrian mountains, or lake di- 

 strict, that of Ingleton on the south of the carboniferous 

 limestone encircling this group appears to constitute a small 

 basin reposing on millstone grit, the shattered tract extending 

 hence eastwards to Giggleswick; and the immense faults 

 which traverse this district have been admirably described by 

 Mr. Phillips (Geological Transactions, New Series, vol. ii.). 



On the northern border of the Cumbrian mountains, from 

 Whitehaven on the western coast, to Ravensworth, where the 

 Cumbrian and Penine chains inosculate, on the east, a regular 

 zone of coal-measures appears to succeed the carboniferous 

 limestone, and though the principal workings are at the two 

 extremities, indications have been found at various points be- 

 tween these fields ; hence we may hereafter look for a con- 

 siderable extension beneath the new red sandstone of the Vale 

 of Eden. 



In my next communication I propose to conclude these re- 

 marks by a similar notice of the south-western coal district. 

 Your old Correspondent, 



W. D. CoNYBEARE. 



VIII. On the Influence of the Climate of Naples upon the 

 Periods of Vegetation as compared with that of some other 

 Places in Europe. By John Hogg, Esq., M.A., F.L.S. 

 F.C.P.S., %c. 



[Continued from vol. iv. page 279.] 



II. Erondescence. 



THE time of the unfolding of the leaf-buds of trees, which 

 Linnaeus has called Frondescentia, and which the French 

 botanists have distinguished by the word Bourgeo?inement, pre- 

 sents the same variations that have been observed in the ger- 

 mination of seeds : since the diversity of the climates and of 

 the seasons exerts likewise a great influence on this period of 

 vegetation. 



In the same places of his Philosophia Botanica before men- 



