96 Faraday on New Electro-Magnetical Motions. 



is every reason to believe that it will act in the same way with 

 the earth, and take a direction perpendicular to the magnetic 

 meridian. It also should act with the magnetic pole of the 

 earth,, as with the pole of a magnet, and endeavour to circulate 

 round it. Theoretically, therefore, a horizontal wire perpendicular 

 to the magnetic meridian, if connected first in one way with a 

 voltaic battery, and then in the opposite way, should have its 

 weight altered ; for in the one case it would tend to pass in a 

 circle downwards, and in the other upwards. This alteration 

 should take place differently in different parts of the world. 

 The effect is actually produced by the pole of a magnet, but I 

 have not succeeded in obtaining it, employing only the polarity 

 of the earth. 



Sept. 11, 1821. 



Art. X. Letter from Dr. Hastings to the Editor, respecting 



the Division of' the Eighth pair of Nerves. 

 Sir, 



As the accuracy of my experiments on the par vagum, con- 

 tained in a former Number of your Journal, has been established 

 by those since conducted at the Royal Institution, I should 

 not add one sentence to what has been already written on the 

 subject, had not Mr. Broughton in his reply made personal 

 allusions, which compel me to state. 



That my observations were made in consequence of the ac- 

 cusation of inaccuracy, brought against me by that gentleman ; 

 and that I have again, with great care, compared them with his 

 first paper, and can perceive no instance in which they are not 

 fully applicable to it. In what part of Mr. Broughton's first 

 paper does he say, that the contents of the stomachs of the 

 rabbits operated on, were compared with those of the stomachs of 

 healthy rabbits, similarly fed, and killed at the same time ? where 

 does he say that the eighth pair of nerves in the dog were found 

 after death divided, or that he took care to place the animal in 

 such a situation, that he must have observed it, if it had vomited 

 any part of the milk ? where docs he say that he found the 

 ends of the nerves uniformly apart from each other .' what 



