REV. CHARLES DRESSER.
THE GLOBE HOTEL, SPRINGFIELD, ILLINOIS.
A BROOK IN THE DEPARTMENT OF VAR, FRANCE.
JEAN BAPTISTE CAMILLE COROT.
A BY-PATH.
EARLY MORNING.
DIANA'S BATH.
A SHALLOW RIVER.
THE EDGE OF THE FOREST (FONTAINEBLEAU).
ON THE RIVER OISE.
THE STORMY SEA.
A SUNLIT GLADE.
A SHEPHERD AND HIS FLOCK.
"THE MAN WITH THE LEATHERN BELT."
THE STONE-BREAKERS.
THE GOOD SAMARITAN.
SERVANT AT THE FOUNTAIN.
AN UNHAPPY FAMILY.
[Illustration: PICTURES TAKEN BY PROFESSOR ARTHUR W. WRIGHT OF YALE
COLLEGE, SHOWING THE DIFFERENCES BETWEEN SUBSTANCES IN PENETRABILITY
TO THE ROeNTGEN RAYS.
1 and 3. Flint glass prism (very opaque).
2. Quartz prism, showing transmission of the rays through the thin
edges.
4. Prism of heavy glass, more opaque than flint glass.
5. One-cent coin, copper.
6. Five-cent coin, nickel.
7. White-crown glass, 11/2 millimetres thick.
8. Blue crown glass, 2 millimetres thick.
9. Yellow crown glass, 11/2 millimetres thick.
10. Crown glass, 1 millimetre thick, covered with a very thin layer of
gold.
11. Red crown glass, 2 millimetres thick.
12. Block of Iceland spar (very transparent to ordinary light, but
very opaque to Roentgen rays).
13. A bit of tinfoil.
14. Aluminium medal, showing faint traces of the design and lettering
on both sides, as if it were translucent.
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