VI 



CONTENTS. 



Notice of the Habits of a Cynipideous Insect, 

 parasitic upon the Rose Louse (A^phis r&sae) ; 

 with Descriptions of several other parasitic 

 Hymen6ptera. By J. O. Westwood, Esq. 

 F.L.S. &c 491 



BOTANY. 



Some Account of an aged Yew Tree in Buck- 

 land Churchyard, near Dover. By the Rev. 

 W. T. Bree, M.A. - - - 47 



Brief Notices of the Plants observed during a 

 Tour through a Part of North Wales, and 

 some of the adjoining Counties. By William 

 Christy, Jun. Esq. F.L.S. - - 51 



Plants observed in the Neighbourhood of Bar- 

 mouth, North Wales. By Thomas Purton, 

 Esq., Author of " A Midland Flora " - 57 



On the Distinctions between the Linnasan Ge- 

 nera Potentilla and Tormentflla. By Charles 

 C. Babington, B.A. F.L.S. &c. - - 248 



Some Remarks relating to the Fall of an aged 

 Ash Tree. By the Rev.W. T. Bree, M. A. 327 



Facts in relation to the Physiological Economy 

 of the Mistletoe (Fiscum album L.) By the 

 Rev. J. S. Henslow, A.M., King's Professor of 

 Botany in the University of Cambridge, &c. 499 



GEOLOGY 



Notice of a Lily Encrinite lately found in Moun- 

 tain Limestone, brought from the Neighbour- 

 hood of Cork, Ireland. By C. Conway, Esq. 



A Notice of the Fossils met with in a short 

 Tour in Derbyshire. By H. H. G. - 129 



Observations on the supposed Connection of 

 Rocks with Plants. By Alexander Murray, 

 M.D. and A.M., Aberdeen - - 335 



Volcanoes. By W. M. Higgins, Esq. F.G.S. 

 Lecturer on Natural Philosophy in Guy's 

 Hospital, and J. W. Draper, Esq. - 344 



A short Account of a Fossil Skeleton of a Ple- 

 siosaurus, lately discovered near the Town of 

 Bedford. By Mr. Edmund R. Williamson 422 



Observations on the Affinities between Plants 

 and subjacent Rocks. By Mr. Hewett C. 

 Watson - - - - 424 



METEOROLOGY 

 The Weather at Florence. By W. 





Spence, 



- 252 





REVIEWS. 



Catalogue of Works on Natural History, lately 

 published, with some Notice of those con- 

 sidered the most interesting to British Natu- 

 ralists - - 60.131.255.351.428.501 



Literary Notices - 66. 138. 2G7. 263. 442. 508 



SHORT COMMUNICATIONS - 67.139.268.364.447.510 



MISCELLANEOUS INTELLIGENCE. 



Retrospective Criticism - 78. 159. 27?. 369. 464. I Queries and Answers - 90. 183. 282. 381. 476. 



551 I Obituary - - - - 562 



Index to Books reviewed and noticed 

 General Index - - 



- 563 



- 564 





