CONTENTS. 
NUMBER PAGE 
XXVIII. New Stelar Facts , and their Bearing on Stelar Theories for the 
Ferns. By John M'Lean Thompson, M.A., D.Sc., F.L.S., Lecturer 
on Plant Morphology, Glasgow University. (With Four Plates 
and Nine Figures in the Text), . . . . .715 
XXIX. Isle of Wight Disease in Hive Bees. 
(1) The Etiology of the Disease. By John Rennie, D.Sc. ; Philip 
Bruce White, B.Sc. ; and Elsie J. Harvey. (With 
One Plate), . . -. . . . 737 
(2) The Pathology of Isle of Wight Disease in Hive Bees. By 
Philip Bruce White, B.Sc., Bacteriologist to the Bee 
Disease Investigation, University of Aberdeen and N. of 
Scotland College of Agriculture. (With One Plate), . 755 
(3) Isle of Wight Disease in Hive Bees — Experiments on Infection 
with Tarsonemus woodi, n. sp. By Elsie J. Harvey, . 765 
(4) Isle of Wight Disease in Hive Bees — Acarine Disease: The 
Organism associated with the Disease — Tarsonemus woodi , 
n. sp. By John Rennie, D.Sc. (With One Plate and Two 
Figures in the Text), ...... 768 
XXX. ShacJcleton Antarctic Expedition , 1914-1917 : Depths and Deposits 
of the Weddell Sea. By J. M. Wordie, M.A., F.G.S., . . 781 
XXXI. Shackleton Antarctic Expedition , 1914-1917 : The Natural History 
of Pack-Ice as observed in the Weddell Sea. By J. M. Wordie, 
M.A., F.G.S. (With Nine Text-figures and Four Plates), . . 795 
XXXII. On Old Red Sandstone Plants showing Structure, from the Rhynie 
Chert Bed, Aberdeenshire. Part IV. Restorations of the Vascular 
Cryptogams and Discussion of their Bearing on the General 
Morphology of the Pteridophyta and the Origin of the Organisa- 
tion of Land-Plants. By R. Kidston, LL.D., D.Sc., F.R.S., and 
W. H. Lang, D.Sc., F.R.S., Barker Professor of Cryptogamic Botany 
in the University of Manchester. (With Five Plates), . . 831 
XXXIII. On Old Red Sandstone Plants showing Structure, from the Rhynie 
Chert Bed, Aberdeenshire. Part V. The Thallophyta occurring in 
the Peat-Bed ; the Succession of the Plants throughout a Vertical 
Section of the Bed, and the Conditions of Accumulation and Pre- 
servation of the Deposit. By R. Kidston, LL.D., D.Sc., F.R.S., and 
W. H. Lang, D.Sc., F.R.S., Barker Professor of Cryptogamic Botany 
in the University of Manchester (With Ten Plates and One Figure 
in the Text), ........ 855 
Index, 
. 903 
