LETTERS FROM HERSCHEL AND HAIDINGER. 179 



some nebulae, which prove him to have been a careful and 

 accurate observer, and make his loss much to be regretted 

 on that score also, as well as on that of general power. 



The work was addressed to me by his " representatives" 

 but as no names were mentioned or addresses, I knew not 

 how to acknowledge it. As you are in communication with 

 the parties, I will request you to convey to them my best 

 thanks for their interesting paper, and I beg to remain, sir, 



With much regard, 

 Your obliged and obedient servant, 



J. F. W. HERSCHEL. 

 COLLINGWOOD, Dec. 27, 1842. 



FROM PROFESSOR HAIDINGER. 



VIENNA, April 2, 1860. 



..... I SHALL be most happy to welcome our most 

 excellent friend, Professor Dana, restored by his stay in 

 Italy. I am much afraid our western neighbor will not let 

 Europe approach to anything like peace ; he is working 

 about curing social evils by political changes, which only 



tend to aggravate the difficulties of the former 



In a late communication of mine to our academy relative to 

 another account of the meteoric iron, I began calling at 

 tention to the noise caused by meteorites, and usually called 

 explosions;, as not belonging to anything like a real explo 

 sion like that of gunpowder, but simply to the repletion of 

 an empty space, following the meteorite, and kept in that 

 state by the rotatory motion of the latter, till its process is 

 checked by the resistance of the atmosphere. I should 

 very much like to call your attention to this subject. I 

 have also to give an account of our Bohemian meteor of 

 November 28th. 



Ever most truly yours, 



W. HAIDINGER 



