[A BIRTHPLACE OF AVALANCHES, MONT BLANC.]
[M. JANSSEN'S OBSERVATORY ON TOP OF MONT BLANC.]
[VIEW FROM THE SUMMIT OF MONT BLANC, SHOWING THE MATTERHORN IN THE DISTANCE.]
[FIGURE I.--APPARATUS USED BY PROFESSOR W.F. MAGIE IN TAKING A SKIAGRAPH OF A HAND.]
[FIGURE 2.--SKIAGRAPH OF A FOOT, SHOWING AN EXTRA BONE IN THE GREAT TOE.]
[FIGURE 3.--SKETCH OF A BABY'S FOOT AS SEEN THROUGH A SKIASCOPE.]
[FIGURE 4.--SKETCH OF A BABY'S KNEE AS SEEN THROUGH A SKIASCOPE.]
[FIGURE 5.--SKIAGRAPH OF A BULLOCK'S EYE.]
[FIGURE 6.--SKIAGRAPH OF A DEAD HAND AND WRIST, SHOWING TWO BUCK-SHOT AND A NEEDLE.]