UNIVERSITY OF WUeRZBURG.
SKELETON OF A FROG, PHOTOGRAPHED THROUGH THE FLESH.
RAZOR-BLADE PHOTOGRAPHED THROUGH A LEATHER CASE AND THE RAZOR-HANDLE.
SKELETON OF A FISH PHOTOGRAPHED THROUGH THE FLESH.
A HUMAN FOOT PHOTOGRAPHED THROUGH THE SOLE OF A SHOE.
PHOTOGRAPHING A FOOT IN ITS SHOE BY THE ROeNTGEN PROCESS.
BONES OF A HUMAN FOOT PHOTOGRAPHED THROUGH THE FLESH.
CORK-SCREW, KEY, PENCIL WITH METALLIC PROTECTOR, AND PIECE OF COIN.
COINS PHOTOGRAPHED INSIDE A PURSE.
DR. WILLIAM J. MORTON PHOTOGRAPHING HIS OWN HAND UNDER ROeNTGEN
A GROUP OF FAMILIAR ARTICLES UNDER THE ROeNTGEN RAYS.
THOMAS A. EDISON EXPERIMENTING WITH THE ROeNTGEN RAYS.
"I ... TRIED A STEP TOWARD THE STAIRS, WITH EYES ALERT ..."
"HE STOOD SIDEWAYS, ... AND LOOKED AT ME OVER HIS LEFT SHOULDER."
"FACE TO FACE WITH THE REAL HOUSEHOLDER."
OLD STATE-HOUSE AT SPRINGFIELD, ILLINOIS.
A HARRISON BADGE OF 1840.
A HARRISON BUTTON OF 1840.
LINCOLN IN 1860.
ABRAHAM LINCOLN IN 1861.
WILLIAM HENRY HARRISON, NINTH PRESIDENT OF THE UNITED STATES.
JOSHUA F. SPEED AND WIFE.
MARY TODD LINCOLN.
LINCOLN IN 1858.
ROBERT S. TODD.
MISS JULIA JAYNE, ONE OF MISS TODD'S BRIDESMAIDS.
GENERAL JAMES SHIELDS.
MRS. NINIAN W. EDWARDS.
COURT-HOUSE AT TREMONT WHERE LINCOLN RECEIVED WARNING OF SHIELDS'S
CHALLENGE.
RESIDENCE OF NINIAN W. EDWARDS, SPRINGFIELD, ILLINOIS.
LINCOLN'S MARRIAGE LICENSE AND MARRIAGE CERTIFICATE.
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.