[ 3 ] 
of expenfive ftone-work in building harbours may 
be avoided, by the help of furze mounds, 
I am, 
With the greateft refpedt, 
Reverend Sir, 
, , > / ; . / 
Your moft obedient, 
humble fervant, 
Had". Dec. 13, 1760. Du. Walk, 
II. An Account of a remarkable Halo : In 
a Letter to the Rev . William Stukeley, 
M . D . F. R. S. from Tho. Barker, Efq\ 
Read Jan. 8, 
1761. 
Reverend Sir, 
1 Thank you for prefenting my paper on 
the Dog liar to the Royal Society; 
the opinion advanced in which is fo very unufual, 
that I expedt it will be at once rejected, as incredible, 
by all, who do not care for the work of examining 
the evidence for it. But I fhould be glad to hear, 
that fome impartial perfon had carefully fearched, 
whether what I have laid be fupported by fadt, and 
what other evidence can be found, which I have 
miffed, either .in fupport or confutation of that 
change of colour in Sirius, which I have fuppofed. 
I have long negledted to acknowlege the favour of 
your information about the comet in Orion laff Ja- 
nuary j but had nothing particular to fay about it, not 
B 2 having 
