FISHES AND FISHING. 



297 



to four feet long ; the fishermen immerse one end in 

 the water, and leaning over the gunwale of their boat, 

 and allowing no light to come to their eye, they look 

 through the glass, whereby they can see objects per- 

 fectly clear, ten to fifteen fathoms deep, or sixty to 

 ninety feet. 'Navy and coasting vessels of Norway 

 carry them to examine if their anchors be foul. 

 They have been introduced and used on the Tay, 

 whereby in twelve feet water everything is seen as if 

 at the surface. The meanest fisherman can make 

 them.'* I should think our Baltic fleet availed them- 

 selves of this invention to aid their navigation, or to 

 detect any dangerous snare laid for them. I wrote to 

 Admiral Dimdas on the subject, when he commanded 

 in the Baltic, knowing him from his having been my 

 patient : he called and thanked me on his return. 



Mr. Leslie, of Lausenburgh, U.S., has constructed 

 an instrument for examining the beds of rivers, or 

 other situations under water, to facilitate excavation, 

 speedy discovery of drowned bodies, or of lost pro- 

 perty. It is by the addition of lamps useful at night. 

 I have not seen any instrument of the kind in this 

 country ; and if it be useful as stated, it should be 

 brought into notice. A tolerably clear explanation 

 of it is given in the ** Journal of Science, Literature, 

 and the Arts," No. xxxv., 1824; John Murray, 

 Albemarle Street, London. 



