PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
SESSION 1916-17. 
Part III] VOL. XXXVII. [ p P- 209-304 
CONTENTS. 
NO. 
PAGE 
210 
^onian 
XIII. The Arithmetical Mean and the “ Middle ” Value of certain 
Meteorological Observations. By L. Becker, Ph.D., Begius 
Professor of Astronomy in the University of Glasgow, 
{Issued separately June 25, 1917.) 
XIV. On some Nuclei of Cloudy Condensation. Part III. 
Dr John Aitken, F.R.S., 
(Issued separately June 28, 1917.) 
XV. Experiments and Observations on Crustacea : Part IV. Some 
Structural Features Pertaining to Glyptonotus. By John 
Tait, M.D., D.Sc. (From the Scottish . Oceanographical 
Laboratory and from the Physiological Laboratory of 
Edinburgh University.) (With twenty-two figures in the 
text), ........... 246 
(Issued separately July 5, 1917.) 
XVI. Experiments and Observations on Crustacea : Part V. A 
Functional Interpretation of certain Structural Features 
in the Pleon of Macrurous Decapods. By John Tait, 
M.D., D.Sc. (From the Marine Laboratory, Aberdeen, 
and the Department of Physiology, Edinburgh University), 304 
(Issued separately July 9, 1917.) 
EDINBURGH: 
Published by ROBERT GRANT & SON, 107 Princes Street, and 
WILLIAMS & NORGATE, 14 Henrietta Street, Covent Garden, London. 
Price Five Shillings and Sixpence. 
