A non-descript Fish. 39} 
Iu this manner, without entering into a detail that might be 
perplexing if not illustrated by visible figures, some notion it is 
apprehended may be formed, of the shape and structure of an arch 
of such a bridge as is constructed on the principle of tenacity ; 
and of the way in which it is supported and elevated. The same 
principle is resorted to in respect to the form and arrangement of 
the several other parts of the structure, wherever it is admissible, 
by giving to the iron pieces the shape of ribs, and connecting 
them so as to constitute as much as possible, Pe aks body 
that may rest upon perpendicular standards, which are to pos~- 
sess sufficient strength, but to be divested of extravagant bulk. 
By this construction, the least practicable degree of impediment 
is presented to the passage of the waters and the navigation of 
the river; and the greatest economy may.be promoted in the 
expenses of materials and labour, and of course of time and mo- 
ney. Inthe article of iron, one half the quantity it is said, 
may be saved, that would be requisite to cowplete a bridge of the 
same dignensions on the ordinary construction. 
Mr. Dodd, the engineer, the inventor of the system, has it 
seems estimated the expense of the proposed Hammersmith 
bridge, which will be 600 feet over the river Thaines, at 50,000/, 
and that of the designed gigantic structure, the East London, or 
bridge of Trafalgar at Rotherhithe, though its chord will he 
3,400 feet, and its altitude, to allow ships to sail beneath it, will 
probably be 110 feet above the tide at high water, he reckons 
will not exceed the sum of 300,000/. The latter structure will 
consist of three arches, of 320 feet cach over the water, and eight 
others, of more than 300 feet each on the average, over the land 
on either side, 
A NON -DESCRIPT FISH, 
Captain Mudge, one of the gentlemen employed in the Trigo- 
nometrical Survey, has stated, that a few days before he left 
Shetland, he had received a letter from a gentleman of large pro- 
perty there, informing him, that a fish of very singular appear- 
ance had been taken off the island of Unst, where Captain Mudge 
had been stationed with M. Biot. The fish was to have been sent 
‘to Captain Mudge, but it did not arrive in time, and therefore he 
‘knew it only irom the description given of it by his correspondent, 
which was very minute and particular. It was of the flat species, 
about four feet long, and was most auply provided with fins ; but 
its distinguishing peculiarities were two antenne or feelers, 
about eight or ten inches long, standing erect from the head, 
each crowned with a fine tuft resembling a flower; whilst on the 
‘under part, near the breast, were two hands exactly resembling 
‘the human hand, except that they were palmated or webbed. 
Captain 
