224 ON THE EFFECTS OF CERTAIN MENTAL 



the dark ;" and that the specific appellation, luschiia, is Latin, de- 

 rived from litgens, mournful, and ca7io, to sing ; although to my 

 apprehension the song of this bird is, for the most part, lively and 

 inspiriting, rather than plaintive. The x^^'^^ of the Grecian j)oets 

 does not, in all cases, refer to this particular species, though com- 

 monly translated Niglitiriiiale : they not unfrequently apply to it 

 the terms green, and green-necked ; from which it seems highly 

 probable that the Sijlvia hippolais of continental naturalists is then 

 intended — a splendid songster, but which does not visit the British 

 islands — though our systematists have, by mistake, appended the 

 term hippolais to another and a very different bird, which is a com- 

 mon summer mi;^rant in the south of England. This last-men- 

 tioned species has, however, been lately distinguished by a separate 

 appellation, loqiiax. I may finally add that the Buhl-buhl of the 

 poets of the East is not, as is commonly reported, our Nightingale. 



ON THE EFFECTS OF CERTAIN MENTAL AND 

 BODILY STATES UPON THE IMAGINATION.* 



BY LANGSTON PARKER, ESQ. 



II1._THE IMAGINATION OF SLEEP-WALKERS. 



During perfect sleep, that is, during the comi)lete and undis- 

 turbed repose of both body and mind, we are dead and insensible to 

 the world around us, and are totally cut off from all communication 

 with external objects, whether they are presented to the senses or to 

 the Imagination. Sleep, like his brother Death, annihilates all our 

 faculties, destroys perception, throws over our senses a veil of total 

 insensibility, and, though differing in nature and appearance from 

 his terrible relative, presents points of similarity which are at once 

 recognised by all. 



'• Death and his brother Sleep : — 



One, pale as yonder waning moon, 



With lips of livid blue ; 



The other, rosy as the morn 



When, throned on Ocean*s wave, 



It blushes o'er the world ; 



Yet both so passmg wonderful."f 



• The following is the third of a series of Lectures delivered at the Bir- 

 mingham Philosophical Institution, by the author, 

 t Shelly. 



