55 
green and brown, to amber, the greenish brown being most com- 
mon. 
EAST WALL. — Tubes filled with drillings from the suc- 
cessive strata passed through in search for oil. One of these 
represents a huge producer in the MacDonald field. A piece of 
the sandstone from which the oil is obtained is placed at the 
bottom. 
WEST WALL. — Chart showing a geological section be- 
tween Olean, N. Y., and Fort Wayne, Ind. Note the position 
of the oil bearing sands in these and the comparatively undis- 
turbed condition of the strata. Such conditions have been favor- 
able to the storage of vast quantities of petroleum and gas. 
SOUTH WALL.- — Chart showing a geological section be- 
tween Olean, N. Y., and Massillon, Ohio. 
CASES 5 AND 6. — Specimens of oil-bearing rocks from a 
large number of localities. Besides sands will be seen lime- 
stones and sandstones, which show that compact rocks may carry 
petroleum as well as loose sands. 
CASE 7. — Minerals and fossils of the oil bearing strata. 
CASE 8. — A large bottle — the largest ever blown — repre- 
senting one barrel of petroleum. 
CASES 9, 10 AND 11. — iThe products of the barrel of pe- 
troleum represented in Case 8, arranged according to the order in 
which they are obtained. These are (1), naphtha; (2), burning 
oils, and (3) residuum or petroleum tar. The processes and pro- 
ducts of further distillation of the latter will also be seen. 
CASE 12. — Model of a modern oil refinery. 
Above this model will be seen one of the original refinery, 
built in Cleveland, O., in 1863. 
The cases following show various finished products ready 
for sale, these being chiefly illuminating and lubricating oils with, 
however, a large variety of other useful articles. 
CASES 13 AND 14. — Fifty-six varieties of burning oils, 
showing the standard required by law in the several different 
States. 
CASE 15. — Cylinder oils of many grades. These are the 
heavier, more sluggish lubricating oils. 
