659 
SECTION II. 
(Read May 5th, 1846.) 
47. In addition to the facts enumerated in the 
first section of this memoir, further investigations 
have led to the discovery of others of a no less 
interesting character. By extending the examin- 
ation of British silver coins, I find that the whole 
of them are more or less magnetic. The half- 
crowns of the present reign, that have come under 
my observation, are certainly all magnetic, and 
some of them display considerably high magnetic 
- powers, more especially those of the years 1842, 
1844, and 1845; anda Victoria shilling, coined 
in the year 1842, is still more magnetic than any 
of the half-crowns. 
48. The half-crowns of George the Fourth are, 
in general, highly magnetic, though but very few 
of them display such high magnetic powers as 
some of those of William the Fourth. There is 
something remarkable in the following fact :—I 
have not met with any of the half-crowns of 
