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But the greatest difficulty attending a navigator in very high 

 latitudes is how to get back again, for, fhoutd he be befet 

 there in the ice, his fituation would be very dangerous; for 

 he might be detained a long time, if not for the whole winter. 

 I fpeak this from experience, for I was once befet for three 

 months, and was given up for loft, and with difficulty got out. 



Any further information in refpe£t to the land, the currents, 

 ice, or other particulars, you may wifh to have, I mall very 

 readily communicate it, and am, 



S I R, 



N 6 5, Spring-ftreet, 

 Shadwell, Feb. 2.5 

 1776. 



Your very humble Servant, 



JAMES MARSHALL, 



Captain Heath, to whom I am indebted for this communi- 

 cation, alfo informs me, that on the 1.5th of December, 1777, he 

 minuted the following particulars from a perfon employed in the 

 whale fifhery. 



" That being on board the Prince Frederick of Liverpool in 

 " 1765, commanded by James Bifbrown, he reached the lati- 

 " tude of 83 0 40', where he was befet in ice for three weeks to 

 " the Southward, but that he faw, during this time, an Open 

 " fea to the North." 



The Aftronomer Royal having been fo good as to furnifh me 

 with the following memorandum, which he made at the time it 

 bears date, I here fubjoin it, as a well authenticated infbnce of a 

 Navigator's having reached 84 degrees and a half of Northern 

 latitude.. 



Mr, 



