IO2 New Theories of the Great Forces. 



These clouds sometimes range themselves 

 evin by day in a similar manner to the beams 

 of the aurora and then disturb the course of 

 tb magnetic needle in the same manner as 

 the latter. On the morning after every dis- 

 tinct nocturnal aurora the same superim- 

 posed strata of clouds have still been ob- 

 served, that had previously been luminous." 



PARRY even " saw the great arch of the 

 northern light continue throughout the day." 



" ARAGO was of the opinion that each ob- 

 server saw his own aurora somewhat as each 

 observer of a rainbow sees the luminous arc 

 differently placed." 



The Great Sun Battery. 



10. (Page 44.) If with a percussion cap 

 and a tear we may develop sufficient power 

 to deflect a magnetic needle 3,000 miles dis- 

 tant, what power may not be expected of the 

 sun, 1,250,000 times larger than the earth ; 

 the sun exercising a force of the same char- 

 acter? 



Gravity. 



11. (Page 50.) "PROF. MOSSOTTI has re- 

 cently shown, by a very able analysis, that 



