YORKSHIRE NATURALISTS IN UPPER TEESDALE. 285 



rigidum with yellow styles); H. rigidum Backh., with dark styles; 

 If. vu/gatum Fr. ; H. vulgatum Fr. resembling diaphanoides Find. ; 

 H. commutatum Backh. ( — H. boreale) ; H. anglicum Fr. ; H. iricum 

 Fr. ; H. gothicum Fr. ; H. murorum L. 



In Cryptogamic Botany, Mr. M. B. Slater, F.L.S., reported that 

 Mr. R. Barnes, of Saltburn, who had worked at the Mosses during 

 the three days, had detected the following species : — 



Sphagnum acutifolium Ehrh. var. Orthotrichum leiocarpum B. & S. 



luridum Hiieb. Tetraplodon mnioides Hedw. 



Sphagnum tenellum Ehrh. Bartramia ithyphylla Brid. 



Andrerea alpina Turn. Bartramia pomiformis L. 



Andrerea crassinervis Bruch. Webera cruda Schreb. 



Gymnostomum rupestre Schwg. Webera albicans Wahl. 



Ancectangium compactum Schl. Bryum alpinum L. 



Rhabdoweissia denticulata Brid. Zieria julacea Schpr. 



Dicranella rufescens Turn. Diphyscium foliosum L. 



Dicranum fuscescens Turn. Fissidens fontanus Wils. 



Campylopus atro-virens DeNot. Fissidens decipiens DeNot. 



Archidium phascoides Brid. Antitrichia curtipendula L. 



Blindia acuta Hedw. Heterocladium heteropterum Bruch. 



Didymodon sinuosus Wils. Eurhynchium teesdalii Sm. 



Distichium capillaceum L. Plagiothecium pulchellum Hedw. 



Encalypta ciliata Hedw. Hypnum uncinatum Hedw. 



Grimmia funalis Schwgr. Ptychomitrium polyphyllum B. & S. 



Rhacomitrium protensum Braun. Ulota crispula Bruch. 



Amphoridium mougeotii B. & S. Amblyodon dealbatus Dicks. 



Ulota drummondii Grev. Webera elongata Dicks. 



Orthotrichum stramineum Hornsch. Cinclidium stygium Swartz. 



This list includes some rare species, although none which have not 

 been previously recorded. 



For the Geological Section, of which both Secretaries, 

 S. A. Adamson, F.G.S., Leeds, and S. Chadwick, F.G.S., Malton, 

 were present, the following report is furnished by Mr. Adamson: — 



The chief interest to the geologists lay in the inspection of the 

 famous Whin Sill, so well known from the references to it by 

 geological writers during the last sixty-five years. The Whin Sill 

 was described by Sedgwick to have been produced by a lateral 

 injection of volcanic matter in a state of igneous fusion, or in other 

 words, to be a tabular mass of basalt or ancient lava injected 

 horizontally between Carboniferous strata after their deposition 

 and consolidation. This opinion is shared in by many subsequent 

 writers, including Topley, Lebour, and others. W'hin is the local 

 name for basalt, but this term is applied in other localities to various 

 rocks of a hard character. Sill is an expressive term, generally used 

 in speaking of the flat piece of stone at the foot of a window. It also 

 gives a fair idea of these tabular beds of basalt, sill-like in their 



Sept. 1889. 



