312 To restore IVIi'ite in Paintings. — Discovery Ships. 



under them in the night. By this means thousands of these leaf- 

 devouring insects niav be destroyed every morning, bv removing 

 these traps, with their tenants, at an early hour^ and replacing 

 the rags for the destruction of others. 



Horse-dung, clav, sand, and pitch-tar form a composition, 

 which, when applied to the trunks and stems of fruit-trceSj after 

 they are properly cleaned, prevents that spontaneous exudation 

 called gumming, which is very injurious to the growth of trees. 



Mr. Knight is of opinion, founded on actual experiment, that 

 oak timber would be much improved, if the tree, after being barked 

 ill the spring, v.'as permitted to stand till the following winter. 



TO RESTORR THE WHITE IN PAINTINGS. 



M. Thenard has applied his oxygenated water vvith great ef- 

 fect for this purpose. The whites are often rendered brown, or 

 even black, where paintings are acted on by sulphurous vapours, 

 especi:dly by sulphurized hydrogen, which is very abundant in 

 some situations. Recollecting that the oxygenated water con- 

 verted black sulphuret of lead into a white sulphate, he furnished 

 an artist, who wished to restore a design of Raphael's, with some 

 of it. By applying it with a pencil the spots were instantly re- 

 moved. Annales de Chimie, xiv. 



THE DISCOVERY SHIPS. 

 Extract of a letter dated North-Shields, Oct. 2. 

 " Having had an interview with Captain Warham, of the 

 British Queen whaler of this port, I am enabled to add his tes- 

 timony to that of Mr. Fleming, in believing that if the discovery 

 ships, under Captain Parry, are well, they must have effected a 

 passage through what is termed the Hyperborean Ocean into the 

 Pacific, and through Sir James Lancaster's-sound, Baffin's-bay, 

 lat. 7-li N., long. Sli W., or thereabouts. Mr. Warham has 

 reason to believe Baffin's-bay is imperfectly known, and that Cap- 

 tain Ross's account is much too brief, he not having ha<l time 

 to explore it. After the British Queen had found her way 

 through the ice in Davis's-straits, and found Disco Island, lat. 

 70^ N., long. 49 V/., she went on to Woman's Isles, J^i N., 

 and nearly the same longitude ; found a clear sea ; sailed across 

 Baffin's-bay for Lancaster-sound, and doubts the existence of 

 James Island, at least it must be of inconsiderable size to that 

 laid down on maps. He found Lancaster-sound, and sailed up it 

 20 miles, meeting a strong swell and wind i'roni the N.W. Tlie 

 sound is about 20 miles broad, widening to the W. : bold high 

 land. Not meeting with whales, and his vovage being to catch 



fish. 



