ILLUSTRATIONS. 



Frontispiece : The Summit of Mount Hamilton in the Winter 

 (4209 feet). 



(From a negative by C. D. Perrine.) 



Figure 1. — The Astronomical Observatory on the Summit 



of Etna (9652 feet) 18 



(From Himmel und Erde, vol. iv. The cut is printed here by the 

 courtesy of the Editor, Dr. M. W. Meyer.) 



2. — The Astronomical Observatory of Nice (1100 feet) 



(founded by M. Bischoffsheim) 19 



3. — On the Way to the Mont-Blanc Observatory . . 21 



(By permission of the niiistrated American.) 



4. — On the Way to the Mont-Blanc Observatory . . 22 



(By permission of the Illustrated American.) 



5. — On the Way to the Mont-Blanc Observatory, (the 



refuge at Grands-Mulets) 23 



(By permission of the Illustrated American.) 



6. — View of Mont Blanc (15,780 feet), Taken from the 



Brevent .......... 24 



(From Annales de I'Observatoire 7nit4orologique du Mont Blanc, I, 

 J. Vallot. Published through the courtesy of the Alpine Club 

 of France.) 



7. — On the Way to the Mont-Blanc Observatory (passage 



OF A crevasse) 25 



(From McCliire's Magazine, by permission.) 



8. — M. Janssen's Observatory at the Summit of Mont 



Blanc (15,780 feet) 26 



(From McCliire's Magazine, by permission.) 



9.— The Meteorological Station on the Santis (8200 feet) 31 



(This figure, from the Potsdam Observations, vol. viii, is here 

 printed by the courtesy of Professor H. C. Vogel.) 



10. — Meteorological Station on the Sonnblick (9843 feet) 32 



(From Himmel und Erde, vol. iv. The cut is printed here by the 

 courtesy of the Editor, Dr. M. W. Meyer.) 



