[ 124 ] 
that I have already {hewn how the principal 'Pheno- 
mena of Electricity may be accounted for, upon 
the few Principles I have laid down ; and how- 
ever in different Experiments the Effects produced 
may either be varied, or increafcd, I doubt not but 
they may all be eafily accounted for from the fame 
Principles j as 1 fhall willingly attempt to make ap- 
pear at fome more convenient Time, fhould it be 
thought necefifary. In the mean time I have the 
Pleafure to fubferibe myfelf. 
Gentlemen , 
Tour rnofi obedient humble Servant , 
John Ellicott. 
XII. A brief account of a Roman Teffera, by 
• Mr. John Ward F. R. S. &* Prof Rhetor . 
Gref . 
Read March “'HE brafs plate, which accompanies 
1747* this paper, and has been the occa- 
fion of it, was dug u^5 fome time fince at Market- 
ftreet in Bedfordfhire ; which lies in the Roman 
road called Watlingftreet , about five miles on this 
fide Dunftablej and was brought to the Society by 
their worthy Member, Samuel Clark Efq;. 
The 
