ügtonnin Dorbi, or May 19, 3780. 239 
hefs continued in the fame degree for án hour and an half. At 
r2t15/, the mercuty had fallen to`żg inches 65 ; and in'a few 
minutes after this, the darknefs began to abate. The mercury 
remained in this ftate until evening, without any fenfible altera- 
tion. At 8^ 30’, it feemed to have fallen a little ; but fo fmall 
was the alteration, that it was attended with fome Sap Bia s ; 
ior could T preceive that. aem tre at pre gin ums 
That ufed in this place was made b; Champney : that which 1 
ufed was made by Narrze : and they may both be depended on 
as to the accuracy of their conftruction. It may, however, be 
proper to obferve, that the houfe where I made my obferva- 
tions, ftood at leaft forty or fifty feet higher than that in which: 
the obfervations were made here. 
. And from. thefe obfervations itis certain, that on the day 
when the darknefs took place, the weight or gravity of the at- 
mofphere was gradually decreafing through the whole day.* 
The'colonr of objects that day, was alfo worthy of remark. 
E: is mentioned; án: gb obíervations: made by the: dom 
heré; that .** the xion of the clouds. was compo 
ef faint red, yellow, ‘and brown : -and hat, during the dark- 
ndis; objects; which commonly appear green, were of the 
peltigreen, verging to blue ; and that thofe which appear 
white; were highly tingcd-with yellow.” Much the fame ob- 
ofervation was-pretty generally made. — Almoft every objeét ap- 
B to meto be ud with ne rather than with any 
ouam 
; E " si 
DT. 4 Farenbii?: s thermoraeter, at ck. at 6.. A. M. was at 39^. , At nt. dt 
Rood at 51>. At 9^. P. M. it was at 469.—4At Cambridge, at 125, it was at 514°, 
At 3°. P. M. it flood at 51° 
