ILLUSTRATIONS
[PICTURES SHOWING THE DIFFERENCES IN PENETRABILITY TO THE RÖNTGEN RAYS.]
[DR. WILLIAM KONRAD RÖNTGEN, DISCOVERER OF THE X RAYS.]
[PICTURE OF AN ALUMINIUM CIGAR-CASE, SHOWING CIGARS WITHIN.]
[PHOTOGRAPH OF A LADY'S HAND SHOWING THE BONES, AND A RING ON THE THIRD FINGER.]
[THE PHYSICAL INSTITUTE, UNIVERSITY OF WÜRZBURG.]
[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 RÖNTGEN 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 RÖNTGEN.]
[A GROUP OF FAMILIAR ARTICLES UNDER THE RÖNTGEN RAYS.]
[THOMAS A. EDISON EXPERIMENTING WITH THE RÖNTGEN 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.]
[WILLIAM HENRY HARRISON, NINTH PRESIDENT OF THE UNITED STATES.]
[MISS JULIA JAYNE, ONE OF MISS TODD'S BRIDESMAIDS.]
[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.]
[THE GLOBE HOTEL, SPRINGFIELD, ILLINOIS.]
[A BROOK IN THE DEPARTMENT OF VAR, FRANCE.]
[JEAN BAPTISTE CAMILLE COROT.]
[THE EDGE OF THE FOREST (FONTAINEBLEAU).]
["THE MAN WITH THE LEATHERN BELT."]
PICTURES TAKEN BY PROFESSOR ARTHUR W. WRIGHT OF YALE COLLEGE, SHOWING THE DIFFERENCES BETWEEN SUBSTANCES IN PENETRABILITY TO THE RÖNTGEN 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, 1-1/2 millimetres thick.
8. Blue crown glass, 2 millimetres thick.
9. Yellow crown glass, 1-1/2 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 Röntgen 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.
15. Metallic mirror, shows no effect of regular reflection.
16. Bit of sheet-lead, 1 millimetre thick.
17. Quarter-of-a-dollar coin, silver.
18. Piece of thin ebonite, such as is used for photographic plate-holder.
DR. WILLIAM KONRAD RÖNTGEN, DISCOVERER OF THE X RAYS.
From a photograph by Hanfstaenge, Frankfort-on-the-Main.