OF ANTHRACITE CAST IRON. D9D9 
at the conclusion of my former paper, we find 
that the iron from the Yniscedwyn works has 
considerable strength. No. 1 stands as No. 14 
in the general summary, and has only two irons 
-of the same number before it. No. 2 stands 
No. 6 in the list, and is stronger than any other 
iron of the same number. No. 3 stands No. 5 
in the list, having only four others in advance 
of it. 
On the whole, the Ystalyfera iron has less 
strength than the Yniscedwyn, but the first 
sample of it possessed toughness in a high degree; 
it was very flexible, and resisted impact with great 
tenacity. The second sample was stronger than 
the first, but offered less resistance to a blow. 
The mean results from the first and second 
samples of this iron, give 410, 468, and 472, for 
the strengths of Nos. 1, 2, and 3 respectively, the 
first of these standing as No. 45, the second as 
No. 12, and the third as No. 11, in the General 
Summary. 
It may not be improper to mention, that the 
parties connected with the Ystalyfera iron works, 
have had other experiments made upon their 
own account; the strengths, as given by these 
