CONTENTS OF VOL. XX. 



NUMBER CXXX. 



Page 



I. Biological Contributions. By George J. Allman, M.B., 



F.R.C.S.I., M.R.I.A., Professor of Botany in Trinity College, Dublin, 

 late Demonstrator of Anatomy and Conservator of the Anatomioal 

 Museum, T.C.D. (With two Plates.) ♦ , 1 



II. On Conjugation in the Diatomacece. By G. H. K. Thwaites, 

 Lecturer on Botany and Vegetable Physiology at the Bristol Medical 

 School. (With a Plate.) 9 



III. Notice of Plants collected in the line of the Rideau Canal> 

 Canada West. By Philip Whiteside Maclaqan, M.D., Royal Cana- 

 dian Rifle Regiment 11 



IV. Description of two new species of Carabus from Asia. By 



T. Tatum, Esq iti<«trt«i>t.ut 14 



V. Additional Notices of British Shells. By J. Gwyn Jeffreys, 

 F.R. &L.S 16 



VI. Characters of undescribed Chalcidites collected in North Ame- 

 rica by E. Doubleday, Esq., and now in the British Museum. By 

 Francis Walker, F.L.S 19 



VII. List of Plants gathered during a short visit to Iceland in 1846. 



By Charles . Babington, M.A., F.L.S., F.G.S. &c 30 



VIII .e Power of the Living Plant to restrain the Evaporation 

 of the Cell ap. By Hugo v. Mohl , *. 34 



IX. On the relative Duration of the Power to Germinate, in Seeds 

 belonging to different Families. By M. Alph. DeCandolle .*. 38 



X. Biological Contributions. By George J. Allman, M.B., 

 F.R.C.S.I., M.R.I. A., Professor of Botany in Trinity College, Dublin, 

 late Demonstrator of Anatomy and Conservator of the Anatomical 

 Museum, T.C.D. (With two Plates.) - % 47 



New Books .--^Manual of British Botany, containing the Flowering 

 Plants and Ferns arranged according to the Natural Orders, by 

 Charles Cardale Babington, M.A., F.L.S. 8rc. — The Elements of 

 Botany, Structural and Physiological, by John Lindley, Ph.D., 



