476 GEOLOGY OF OHIO. 
The ores of the valley, with the exception of one or two standard 
deposits, are very difficult to obtain correct analysis of, owing to the 
above stated causes. 
The following, not published before, made at the Laboratory of the 
State University, during the last 3 or 4 years, may be of interest; the 
samples were in most cases sent to the laboratory by those interested in 
furnaces, and were intended to represent the deposits fairly : 
1 2 3. 4 5 
IMetallichirontgieee eee sista sail a 35.37 36.96 30.20 44.65 38.70 
STUENOWIE TENERHRETP 05006003000000108000060000000000 11.58 2.73 15.80 22.15 35.73 
Tae SRE EE OE RE LT SEE 4,47 3.86 2.97 1B OATS A Go Rake ee 
AUT ayer eo wettest eae otiew comowies 1.78 4.82 10.64 CO aT Pima ace Paes, 
Map nesial Nemmcwcieeieennencae. teens seosae ss 1.23 1.87 1.26 Osa OAR eee ee 
THC ON NOLO EXONO! acosoooegasacccG0qb0900 ebde0 0.60 0.83 0.16 0.41 1.55 
Sully nnter ees oocs eecesesecsocieciciesle seals 0.54 °0.52 0.15 0.40 0.01 
IPNOYSFO) NOVAS csocasoancas90b00K0 500000080 0.257 0.356 0.07 0.175 0.66 
Baird ore—Nelsonville. Chemist, Howard. 
Tron Point ore—Lime and magnesia as carbonates. Chemist, Howard. 
Baird ore—Bessie Furnace. Chemist, Lord. 
Roasted Limestone ore—Average sample. Chemist, Lord. 
New vein of ore 18 in. thick—20 ft. above Zoar limestone. Chemist, Lord. 
SR a ee ma 
The native ores of the valley run on the average rather high in 
silica and phosphorus. This may be illustrated better, perhaps, in 
the character of the pig-iron than by samples of the ores, as the pig- 
iron will collect all the phosphorus in the furnace. As the amount of 
this element furnished by the fuel and flux is very small, the contents 
in the iron may be, without much error, charged to the ore. 
The following are a series of determinations of phosphorus, made 
on samples of pig-iron manufactured from the ores of the Coal 
Measures : 
PHOSPMOLUStconccecseccosescceseacss 0.50 | 0.64 | 0.60 | 0.656} 0.56 | 0.495} 0.86 | 0.77 | 0.997 | 0.885 | 0.725 | 0.627 
The numbers 1 to 5 are samples made about 1879, the others later 
and with, in the last four numbers, some admixture of mill cinder and 
Lake ores, so the best native ores may be considered as yielding a pig- 
