No. 649 
(No. 427 of ourrent series). 
A MONTHLY ILLUSTRATED JOURNAL OF 
NATURAL HISTORY FOR THE NORTH OF ENGLAND. 
EDITED BY 
.T. SHEPPARD, F.G.S., F.S.A.Scot., 
Tue Museums, Hutt; 
AND 
T. W. WOODHEAD, Ph.D., F.L.S., 
TECHNICAL CoLLEGE, HUDDERSFIELD. 
WITH THE ASSISTANCE AS REFEREES IN SPECIAL DEPARTMENTS OF 
J. GILBERT BAKER, F.R.S. F.L.S., GEO. T. PORRITT, F.L.S., F.E.S., 
Prof. P. F. KENDALL, M.Sc., F.G.S., JOHN W. TAYLOR, 
T. H. NELSON, M.B.O.U., WILLIAM WEST, F.L.S., 
RILEY FORTUNE, F.Z.S. 
Contents :— 
PAGE 
Notes and Comments:—Birds of the British Islands; Ingleborough; The Arrival of Man in 
Britain; Gravity and Micro-organisms; Origin of the Trias; ‘Sea-Mills’; A ‘ New Force 
in Nature’; Sir Francis Galton... et a BS as a ae ar : ' 81-84 
The Jurassic Flora of Yorkshire (Illustrated)—A.C. Seward, M.A., F.R.S., etc. ds ... 95-94 
The Evolution of the Millstone (Illustrated)—J. R. Mortimer Nr ft. ase a ws 495-99 
The Spotted Sandpiper in Yorkshire (Illustrated)—Walter Greaves... eat au ... 100-101 
The Accident on the Bempton Cliffs—E.W. Wade, M.B.O.U. ... ie eee .. 102-103 
On Unio distortus Bean, and Alasmodon vetustus Brown, from the Upper 
Estuarine Beds of Gristhorpe, Yorkshire (Illustrated)—J. Wilfrid Jackson, F.G.S. 104-107 
Field Notes ... ok a Si a af Ss rn oe ss ts ah ot 84, 103, 108 
Museum News as: aN re ie ee Eps ai ah ie Hes ae he a. | 9499 
Reviews and Book Notices _.... ae Fe Ay et 5 pt ve A Pe ... 109-110 
Northern News na Dx BP at Pe ee -o Be, wa ay Ey 3h vit 111 
News from the Magazines ... Be ie es ae ae ee La us as i, 112 
Illustrations ... BS Se Bet ‘Ke iy xi U. gi at a Ss fy: 85, 96, 100 
Plates V., VI., VIL, VIII,, IX., X. 
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