IV CONTENTS. 



PAOK 



Art. XXI. On Interesting Changes of Internal Structure ob- 

 served to take place in Solid Arsenious Acid, and 

 other Solid Bodies, . . . . 346 



XXII. KeniarkvS on the Scale adopted for the Ordnance 

 Map of Scotland By A. Keith Johnston, Esq., 

 F.R.S.E., F.G.S., &c. Communicated by the 

 Author, 349 



XXIJI. Meteorological and Astronomical Notices, March 

 1851. By Professor PiAzzi Smyth. Communi- 

 cated by the Author^ .... 353 

 1. Determination of the true Strength and Direction of 

 the Wind. 2. Hour of Observation for Mean Tem- 

 perature. 3, Luminous Meteors and Aurorae. 4, 

 The Asteroids. 5. Bond's Third King of Saturn. 6. 

 ■* Great Reflector for a Southern Country. 7. Obser- 

 vations ofcc Centauri and « Pisciuni. 8. Royal Ob- 

 servatory, Cape of Good Hope, , . 353—365 



XXIV. Scientific Intelligence : — 



GEOLOGY AND MINERALOGY. 



1. Reptilian Footprints in the Lowest Silurians. 2. Map 

 of Iceland. 3. Analysis of Gurolite, a new^ Minei-al, 

 by Dr T. Anderson, .... 366-367 



ZOOLOGY, 



4. Miseries and Delights of the Forests of Guiana, 368 



HYDROLOGY. 



5. The Thunder of Waterfalls, . . . 370 



ETHNOLOGY. 



6. Traces of an Ethnic Connection between the Basin 

 of the Ganges and the Indian Archipelago, before 



the Advance of the Hindus into India, . , 371 



MISCELLANEOUS. 



7. Statistics of London. 8. Surgical Operations with- 

 out pain, by Pajjin, .... 373-375 



XXV. List of Patents granted for Scotland from 18th De- 

 cember 1850 to 22d March 1851, . . 376 



XXVI. LvpEX, 382 



