CONTENTS. 
Art. I. On Columnar Crystallization of Ground-Ice. By the 
Rev. Wititam Scoressy, D.D., F.R.SS. Lond. 
and Edin., Member of the Institute of France, 
&e., &e. (With a Plate.) Communicated by the 
Author, 
II. On the Tides and Dew-Point. By WriuiAm Gat- 
BraiTH, M.A., F.R.A.S., Teacher of Mathema- 
tics. Communicated by the Author, 
III. Description of New Optical Instruments, viz.: 1. Po- 
larizing Spectacles. 2. Picture Polariscope. 3. Po- 
larizing Diaphragm for the Microscope. 4. Sur- 
gical Polariscope. By ALuxanper Bryson, Esq. 
Communicated by the Author, 
IV. Notice of a Shooting-Star ; and on a Method of Cool- 
ing the Atmosphere of Rooms in a Tropical Cli- 
mate. By Professor C. P1azzi Smiru, F.R.S.E., 
&e., 
V. Examination of Professor E. Forbes’s Views on the 
Geographical Distribution of British Plants. By 
A. D’Arcutac, 
VI. On the Action of Lime on Animal and Vegetable 
Substances. By Jonn Davy, M.D., F.R.S. Lon- 
don and Edinburgh, Inspector-General of Army 
Hospitals, : ; : : . 
1. On the Action of Lime on the Textures of the Hu- 
man Body, ; ‘| ; : A 
2. On the action of Lime on Vegetable Substances, 
PAGE 
19 
20 
23 
34 
35 
38 
