450 Summary of Contents 



No. 5. THE SIZE OF THE ICE-GRAIN IN GLACIERS. (From 



Nature, August 22, 1901, Vol. LXIV, p. 399.) . . . 226 



No. 6. ICE AND ITS NATURAL HISTORY. (From the Proceedings 

 of the Royal Institution of Great Britain, 1909, Vol. xix, 

 P- 243-) 233 



No. 7. BEOBACHTUNGEN UBER DIE EINWIRKUNG DER STRAHL- 



UNG AUF DAS GLETSCHEREIS 280 



No. 8. IN AND AROUND THE MORTERATSCH GLACIER : A STUDY 



IN THE NATURAL HISTORY OF ICE. (From the Scottish 

 Geographical Magazine, 1912, Vol. xxvni, p. 169.) . . 283 



These four papers are a portion of the author's work on 

 Ice out of doors, principally on the Morteratsch Glacier. 

 The phenomena observed in the open are found to be 

 regulated by the laws established in the laboratory. Papers 

 Nos. 6 and 8 are illustrated. 



No. 9. THE USE OF THE GLOBE IN THE STUDY OF CRYSTALLO- 

 GRAPHY. (From the Philosophical Magazine, 1895, S. 5, 

 Vol. XL, p. 153.) 313 



The blank globe, whether black or white, with the divided 

 circles belonging to it, is a calculating machine adapted to 

 the solution of all the problems to which the analytical 

 methods of spherical trigonometry are usually applied. 



No. 10. ON A SOLAR CALORIMETER USED IN EGYPT AT THE 

 TOTAL SOLAR ECLIPSE IN 1882. (From the Proceedings of 

 the Cambridge Philosophical Society, 1901, Vol. XI, Pt i, 

 P- 37-) - 337 



The instrument is a Steam Calorimeter, which depends 

 for its indications on change of state and not on change of 

 temperature. The final result of experiments made with it 

 on the uneclipsed sun is that the calorific value of a sheaf of 

 the sun's rays, having a section of one square metre, is at 

 least 9698 gram-degrees centigrade per minute, at the ter- 

 restrial sea-level ; and it is certain that heat can be obtained 

 from them there at this rate, in a useful form, by mechanical 

 appliances of simple construction. Immediately after the 

 total phase of the eclipse was passed, the instrument was 

 pointed to the sun. Steam was not raised until twenty 

 minutes after totality, and from that time onwards the output 

 of steam increased and was recorded until the eclipse was 

 ended. 



No. 11. SOLAR RADIATION. (From Nature, September 5, 1901, 



with Postscript in 1911.) 383 



This is a short article on the subject, and attention is 

 directed to the diminishing value ascribed to the Solar 

 Constant by different observers, since the year 1900. 



