170 Davenport—Chemical Investigation of some 
ness, and known to extend through six degrees of longitude 
with a remarkable uniformity of character, may not speak for 
itself, we shall have to suspend our discussions of a large por- 
tion of the geology of the globe. 
owever, I am in possession of data and specimens from 
Texas, sufficient to show the approximate correctness of the 
outline given in my “Map of the Mississippi Embayment,” as 
well as the close correspondence of the character of the forma- 
tion in that State, to that exhibited by it in the Anacoco region, 
in western Louisiana. “i 
To the two localities of Cretaceous outcrops mentioned by 
Prof. Hopkins, I have to add another, viz: at King’s Salt Works, 
in Bienville; where a genuine “rotten limestone” forms the 
bed of Bayou Castor. 
University of Miss., August, 1872. 
Arr. XXXV.— Contributions from the Sheffield Laboratory of 
Yale College. No, XXV.—Results of a Chemical Investigation 
of some Points in the Manufacture of ‘‘ Malleable [ron ;” by 
Russett W. Davenport, Ph.B. 
THE annealing process employed in making malleable is 
consists, as is well known, in packing the castings with oxide 
each annealing, show what influence the process bas upo? em 
It will be seen the iron us 
ess. The annealed 
n broken were up to the average toughness © 
‘malleable iron,” and their strength did not materially decreas? 
after the second annealing. 
castings whe 
‘ 
I. Casting No.1. Before annealing. 
i 2. 
verage. 
Silicon, "44 "45 “445 
Phosphorus, "29 34 315 
Manganese, "524 534 529 
Sulphur, 054 059 
064 F 
Total Carbon, 3°44 3°42 3°43 
