176 
of those who fall from the line of march are soon supplied, but their work is not 
forgotten. No true work is ever done in vain; if it has not aided others, it has at 
least had a beneficial effect upon the worker himself ; if in itself it has been but a 
trifle, yet it will help to swell the aggregate knowledge and increase the inheritance 
of the next generation. 
“CAERLEON.” 
The following note is from the ‘* Hereford Times” of Tune 12th, 1875, wnder 
signature of John Davies, Brynafall, Abergavenny : [ 
Caerleon cannot be a corruption of ‘‘ Castrum Legionis,” because the word 
“Caer” is purely British, and has nothing Roman about it, and was a component 
of British names a long time before the word “ Castrum” or ‘‘ Castra” was 
introduced into the country. The word ‘‘ Caer” always means a British fortress, 
and the British fortresses in this country are older generally than the Roman 
fortresses. 
I submit that the origin of Caerleon is ‘‘Caer-Llengoedd,” the literal 
translation of which into Latin would be ‘‘Castrum Legionum.” Whether there 
was a British town at Caerleon prior to the Romans I am not prepared to say. 
The fact that the town was called *‘ Caerllengoedd” by the ancient Britons does 
not necessarily imply that there was a British military camp there. I agree with 
Mr. Lee that the British name came from the Roman, but vid translation, and not 
vid corruption. Caerleon is called to this day by the We!sh-speaking people Caer- 
lleon. Caer-lleon is a corruption of ‘‘Caer-Llengoedd,” and Caerleon is the 
Anglicised form of Caer-lleon. 
T ought to add that ‘‘lMengoed” means legions, being the plural form of 
“Neng” (legio). 
The word ‘‘ Caer-Llengoedd ” is highly descriptive, and implies that it was 
a place of importance and magnitude, its meaning being the camp of legions, 
THE RADIOMETER. 
The little instrument you see before you, the phenomena displayed by which 
still remain a mystery to scientific men, originated in some experiments which Mr. 
Crookes was making in the year 1873 on the transmission of heat from one body to 
another. He had been using a vacuum balance, for the purpose of weighing certain 
substances whose temperature was higher than that of the surrounding air and the 
weights, and while doing so he noticed a remarkable phenomenon, viz., an apparent 
diminution of the force of gravitation ; and in order to investigate the nature and 
cause of this strange effect, he devised and constructed a number of forms of 
balance—each successive one being more delicate than the last,—which enabled 
