CONTENTS. 
ORIGINAL COMMUNICATIONS. 
PAGE. 
Description of the Ornithorhynclius Paradoxus. By F. Ryland . 97 
On the Moral Advantages of the Study of Nature ... 102 
History of the Common Dipper (Cinclus aquaticus). By William Mac 
Gillivray, A.M., F.R.S.E., &c. ..... 105 
On the Silurian and other Rocks of the Dudley and Wolverhampton Coal- 
Field, followed by a Sketch proving the Lickey Quartz to be of the 
same age as the Caradoc Sandstone. By R. I. Murchison, F.G.S. 
& V.P.R.S..... 113 
Notes of a Botanist. By J. Murray, F.L. & G.S. 120 
On the Circulation of the Invertebrata, by Langston Parker ... 124 
On the Nests of Birds... . 129 
On the Habits of the Ring Pigeon (Columba palumbus , Linn.) By 
Neville Wood, ... 130 
The Swiftfoot; Extract of a Letter from James Wilson . 132 
The Oscillaria Pharaonis ......... . 134 
REVIEWS. 
A History of the Rarer Species of British Birds. By T. C. Eyton. —The 
Ornithologist’s Text Book; The British Song Birds. By Neville 
Wood, Esq ..... 136 
The Naturalist’s Library. Conducted by Sir William Jardine, Bart., 
F.R.S.E., F.L.S., &c. Entomology, vol. iv. 140 
German Periodicals :—Archiv fur Naturgeschichte ; von Dr. Ar. Fr. Aug. 
Wiegmann. Isis : Encyclopadische Zeitschrift; von Oken . 141 
Extracts from Foreign Journals ... 142 
TO CORRESPONDENTS. 
We are compelled to postpone, until our next number, the appearance of a wood engraving, 
by Jewit, of an Encrinite discovered at Frome, in a very perfect state of preservation, 
and likewise the description of this beautiful fossil. 
“On the application of the principles of induction to the investigation of the Vegetable 
Kingdom, and the inferences in relation to Natural Theology/’ by Robert Dickson, 
M.D., F.L.S., in our next, 
(When our arrangements are completed, we propose devoting about four pages in each 
Number of The Naturalist to a Glossary of Scientific Terms used in Zoology. The 
Glossary will be paged consecutively, for the purpose of being bound in a separate 
volume, and will form, when concluded, a valuable Text Book. 
Erratum. _In part of the impression, page 140, line 20, for “ Lepidotera” read “ Lepidoptera.” 
Communications and Books for Review to be addressed to the Editors of 
“ The Naturalist,” to the care of Mr. Groombridge , Paternoster-row , London. 
