433 
the original colours seeming to be wanting, and the best description 
I can give of it is to liken it to that light produced in a dark 
room when one of the seven original colours is separated from the 
rest after they have passed through a prism, and been collected 
together again by a convex lens. This evening the barometer was 
30T and falling, Ilawkesbee’s thermometer G3°, wind e., ^ force. 
The morning misty and very cold, hut all the day clear. Mr. Jos. 
Sparshall of Wells also send a description of the aurora, as seen by 
him in that town.” 
On the 7th of June, 1750, Mr. Arderon reports on a shock of 
earthquake felt in and near Norwich. Mr. Baker reads the sub- 
stance of it to the Fellows of the Society. “ Mr. Arderon writes 
me word from Norwich, that on Thursday last the 7th instant, as 
ho and a friend were walking to tako the air a little to the w. of 
that city, they heard, about seven in the evening a kind of hollow 
noise as loud as that of a large cannon, which noise was once 
repeated nigh the same place as an echo, and then continued dying 
away as it were for about half a minute. They saw no lightning, 
nor any clouds, except a few thin whitish ones in the western 
horizon. It was heard, he says, by great numbers of people in the 
city of Norwich, notwithstanding the great hurry and bustle there. 
Arderon received accounts of the supposed earthquake from Swan- 
thorpc [Swainsthorpe], six miles s.e., and from Racka [Rackhcath], 
four miles n.e. of Norwich, agreeing with the preceding description. 
Ho did not learn that any person observed any tremor of the 
earth, and confesses that his surprise was so great he did not know 
whether there was or not.” The noise was probably occasioned by 
the bursting of a large meteor. 
In a table of the temperature in the hot July of 1750, he says, 
that the hottest day was on July the 11th, when his thermometer 
(Hawkesbee’s)* stood in the morning at seven, 19°. Evening 
2. 8J° = 102G Reaumur = 83 Fahr.t 
“On Wednesday the 11th which was the hottest day of all, my 
thermometer in the sun’s rays stood 11° above the heat of human 
# I have endeavoured in vain to ascertain the divisions on the Hawksbee 
thermometer. 
+ Here is evidently an error either of Arderon’s or the R. S. reports. 
83 Fahr. = 22.G6 Reaumur. 
