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, 
TRANSACTIONS 
OF THE 
ROYAL SOCIETY OF EDINBURGH. 
VOLUME XLI. PART IIT. 
21. A further Contribution to the Freshwater Plankton of the Scottish Lochs. By W. West, F.L.S., and rs 
G. S. Wust, M.A., F.L.S. (With Seven Plates.) Price: to Public, 5s,; to Fellows, 3s. 9d. 
(Issued June 15,1905.) 
22. The Nudibranchiata of the Scottish National Antarctic Expedition, By Sir Caartes Exror, K.C.M.G, 
Price: to Public, 1s. ; to Fellows, 9d. (Issued June 9, 1905.) 
23. On the Internal Structure of Sigillaria elegans of Brongniart’s “ Histoire des végétaux fossiles.” By 
Roserr Kipsron, F.R.S.L. & E., F.G.S. (With Three Plates.) Price; to Public, 2s.; to 
Fellows, ls. 6d. (Issued June 30, 1905.) 
24. On the Structure of the Series of Line- and Band-Spectra. By J. Haum, Ph.D.  Priee : to Public, 4s. ; ; 
to Fellows, 3s. (Issued July 3, 1905.) 
25. On the Hydrodynamical Theory of Seiches. By Professor: UES With a Bibliographical Sketch. 
Price: to Public, 4s.; to Fellows, 3s. (Issued July 3, 1905.) — 
26. On a Group of Linear Differential Equations of the 2nd Order, including Professor Chrystals Seiche- 
equations. By Dr J. Hatm. Price: to Public, 2s. ; to Fellows, 1s, 6d. (Issued July , 1905.) 
27. The Tardigrada of the Scottish Lochs. By James Murray. (With Four Plates.) Price: to Public, 
3s.; to Fellows, 2s. 3d. (Issued July 20, 1905.) 
[For Prices of previous Volumes and Parts see page 3 of Cover.] 
PRINTED BY NEILL AND CO., LTD., EDINBURGH. 
