Notes and Comments, 115 



holme Tarn and Grassington) ; Herring Gull, Razorbill and 

 Guillemot (Chalk cliffs from Speeton to Bempton, Flamborough 

 Head) ; Puffin (Flamborough cliffs). 



YORKSHIRE COAL SEAMS. 



In the Transactions of the Institution of Mining Engineers 

 Vol. XIV., pt. 2, Prof. P. F. Kendall, M.Sc, has a ' Note on 

 the Correlation of Certain Seams in the Yorkshire Coalfield.' 

 He states that ' It is well known that a relatively unworked 

 tract intervenes between the main area of the West Yorkshire 

 field and that of South Yorkshire, and when some of the most 

 important seams are sought on the northern side of this hiatus, 

 they exhibit notable differences in their development, which 

 not only gravely affect their value, but in some cases render 

 their exact identification a matter of great uncertainly and 

 difficulty. Green, in the memoir on " The Geology of the 

 Yorkshire Coalfield, which is one of our greatest assets, sug- 

 gested that an actual physical barrier intervened separating 

 two areas of coal-growth at the time of deposition of the 

 Silkstone Seam and at that of the Barnsley Bed.' 



AND THEIR CORRELATION. 



The net result of Prof. Kendall's enquiry ' is to confirm 

 Green's classification and to estabhsh that— Haigh Moor = 

 Swallow Wood; Low Brown Metal =Parkgate ; Middleton 

 Main=New Hards or Swilley ; Blocking or Barcelona =Silk- 

 stone ; Beeston=Whinmoor. The employment of the name 

 ' Silkstone ' for the northern seam is sanctioned by over 

 half-a-century of usage ; and, if the South Yorkshire producers 

 were disposed to cavil at the custom that has grown up, it 

 might be pointed out that the West Yorkshire miners have 

 paid the true Silkstone Coal the compHment of attaching its 

 name to one of their very finest coals.' 



A YORKSHIRE HERBARIUM. 



Some years ago, Mr. H. J. Wilkinson, the Honorary Curator 

 of Botany at the York Museum, began publishing a ' Catalogue 

 of British Plants in the Herbarium of the Yorkshire Philosoph- 

 ical Society,' which has been printed, in sections, in the Society's 

 Annual Repoit. The final part (XI.) has been published and 

 IS a substantial list of over 150 pages. In all, nearly 1,600 

 species are enumerated, with particulars of habitat, distribu- 

 tion, locality, date, collector and herbarium. The Catalogue, 

 with index, occupies 344 pages, in addition to which is a 

 ' Historical Account of the Herbarium and the Con- 

 tributors thereto ' (27 pp.), from which we gather that the 

 Society's Herbarium contains over 10,000 specimens, including 

 collectio ns of British Plants from Rev. James Dalton (1827- 



1918 April 1. 



