POLYTECHNIC SOCIETY.

ESTABLISHED A.D. 1833.

THE TWENTY-FOURTH

ANNUAL REPORT.

NEW 1850 BLC

FALMOUTH:

SOLD BY R. LAKE, MARKET-STRAND.

SIMPKIN AND MARSHALL, STATIONERS' HALL COURT,
AND J. WEALE, HIGH HOLBORN,

LONDON.

536

T. VIBERT, PRINTER, PENZANCE.

On a powerful modification of the Static Induction Coil, by Mr. J.N..

Hearder of Plymouth...

On some new Statical and Thermal effects of a powerful Induction Apparatus,

by Mr. J. N. Hearder of Plymouth....

Contributions to the Falmouth Fauna, by W. P. Cocks, Esq.

.....

A few remarks on the Midge Fly which infests the Wheat, by Jonathan

Couch, Esq., F.L.S., &c.

Remarks on the species of Whales which have been observed on the coasts

of Cornwall, by Jonathan Couch, Esq.

.....

8

15

20

25

....

27

47

48

Invention for Improvements in Machinery for Moulding Bricks and Tiles,

by Mr. John Roberts, Builder, of Falmouth

83

Mr. Mackworth on the Ventilation of Mines, by Mechanical and other powers 50

Mr. H. C. Bastian, on the Flora of Falmouth and surrounding Parishes ..

Meteorological Register for 185

Meteorological Summary for 185

kept at Helston, by M. P. Moyle, Esq.

by Lieut. Liddell, R.N., Bodmin.

Meteorological Summary for 1856, by Lovell Squire, Esq., Falmouth.

Treasurer's Annual Statement of Account,

List of Members.

Annual Subscribers.

Subscribers resident out of the County, and Subscriptions and Donations from

Mines.

List of Premiums for 1857.

ERRATA.

In Mr. Moyle's Meteorological Summary of the Weather at Helston,-
Table 1 (Jan) 12th columny for 29:548 ins., read 30.548 ins.; and at the

battom of the same column, for 30-243, read 30·326.

(June):15th column, for 9th, read 19th.

Table 2, (Jan) 13th column, for 42.1°, read 43·2°.