184 Mr. Wottaston’s Method of deferibing the relative 
by it, nor the diftances between the ftars meafured ; yet their 
apparent {tuations being preferved in black and white, with 
the day and year, and hour if thought neceflary, written un- 
-derneath, each card becomes a regifter of the then appearance 
of that {mall portion of the heavens; which is eafily re-exa- 
mined at any time with little more than a tranfient view; and 
which yet will fhew on the firft glance, if there fhould have 
happened in it any variation of confequence. It is obvious, 
that very delicate obfervations are not to be made in this way. 
In order to explain my meaning more fully, a card fo marked 
fhall accompany this paper (fee tab. V. fig. 1.). What I firft hap- 
pened to pitch upon was the conftellation of Corona Borealis, 
which then fronted one of my windows; and which I have fince 
purfued throughout in this method; making the ftars «, 2, y, 
Oy’ Copia sn 5 iH.) That Bo ee and +, fae ively central; together 
with one or two belonging to Bootes, for the fake of conneét- 
ing the whole together. Thefe I have transferred fince on a 
fheet of paper, to try how well they would unite into one 
map; which they have done with very little alteration. A 
copy of that fhall alfo be laid before this Society (fig. 2.). 
My defign was, after marking down all fuch ftarsas are vifi- 
ble with fofmall a magnifier, to go over the whole again with 
another telefcope of a higher power, divided in the fame way $ 
and after that, with a third and a fourth; fo as to comprehend 
every ftar I could difcern. That would difcover fmaller 
changes: but it muft be a work of time, if attempted at all. 
After fuch a rough map of the conftellation is made, the en- 
‘deavouring to afcertain the right afcenfions and declinations of 
thefe, may perhaps be advifeable in the next place, rather than 
dearching for more. 
In 
