CONTENTS. 
On the Theory of Water-Spouts. Se oe Jo 206 
A Method of determining the eet Heat tof Bodies from their 
Expansion. .. ar ve oo ool 
On the Swallow. .. te a oe ae yh ' 
On the real Difference between the spec if ous of the Hu- 
man Body and Sea-water. .. a 2. 282 
Hungarian Agriculture, and Improvements in the Management 
of Sheep and Cattle. .. oe ee an o- 283° 
New Method for purifying Coal Gas, and at the same time in- 
creasing the Product from a given Quantity of Coals. 292 
Improvement in the Method of forming Electrical Planispheres. 
293 
On the received Theory of Heat. oe os) | 294,.A60 
Theory of the Magnetical Variation. .. ar oe ede 
On the Seasons which are most favourable to the Growth of 
Fungi, &c. with an Account sa some of remarkable Growth 
this present Year. ois ee oe ae) 209 
On measuring the mee hs of Cavities seen on the Surface of the 
Moon. .. ae oe oe Jeol 
Account of certain eM in. Involution and Evolution. 
341 
An alphabetical Arrangement of the Places from whence Fossil 
Shells have been obtained ly Mr.JamMEs SowERByY, and drawn 
and described in Vol. 11. of his * Mineral Conchology,” 348 
Description of a new real for ype Liquids with 
Gases. .. oe oe ee robe 
On purifyi ying Coal-Gas, wie increasing the Quantity cpyen 
from a given Weight of Coais. ih a 371 
Remarks on a Paper by Major-General BrisBanek, on he Me- 
thod of determining the Time, the Error, and Rate of a Chro- 
nometer, by Altitudes taken with a Seatant from an artificial 
Horizon. =f an oe ; ws -- 409 
On the Length of the French Metre i OO in Parts of the 
English Standard. .. . oe oe aod 
On the Preservation of Seeds, the Use of Lime in Agriculture, 
and former State of Cultivation in Scotland. ..  .. 436 
