346 Mr. Bishop's Experimental Researches into 



" 'Tis sweet to hear the honest watch-dog's bark 

 Bay deep-mouth'd welcome, as we draw near home ; 

 'Tis sweet to know there is an eye will mark 

 Our coming, and look brighter when we come. 

 'Tis sweet to be awakened by the lark, 

 Or luU'd by falling waters — or the hum 

 Of bees — the voice of girls — the song of birds — 

 The lisp of children, and their earliest words." 



The human voice may be denominated the music of the 

 mind; language, a figurative mode of expressing our ideas 

 and sentiments. The effects flowing from this beneficent en- 

 dowment are overwhelming in contemplation and almost infi- 

 nite in extent. It is principally instrumental to all the moral 

 and physical improvements of man, and enables him to pour 

 forth his otherwise invisible, inaudible, unfathomable thoughts, 

 to his fellow-man and to his God. 



Explanation of Plate III. 

 Fig 1, Is a representation of the larynx, having the left 

 wing of the thyroid cartilage removed, to expose a portion of 

 the internal structux'e. 



a. The right internal surface of the thyroid cartilage. 

 b b. The arytenoid cartilages. 



c c. The thyro-arytenoid ligaments ; the mucous mem- 

 brane being removed. 

 d. The chink of the glottis. 

 e e. The posterior crico-arytenoid muscles. 



f. The left lateral crico-arytenoid. 



g. The cricoid cartilage. 

 h. The trachea. 



i. The membranous and muscular portion of the tra- 

 chea, which regulates its diameter. 

 Fig. 2, Is a representation of the larynx, similar to fig. 1, 

 showing the whole of the muscles of the left side at one view. 

 The mucous membrane is dissected away, and the upper edge 

 of the thyro-arytenoid muscle slightly depressed, to expose 

 the ligaments of the glottis. 



a, h, c, e,f. The same as in fig. 1. 

 d. The thyro-arytenoid, superior muscle. 

 g. The cricoid cartilage. 

 h. The thyro-arytenoid muscle. 

 i Jc. The trachea. 



Fig. 3. This figure presents a section of the larynx, imme- 

 diately above and parallel to the plane of the glottis. The 

 view is vertical, with the mucous membrane removed to show 

 the mechanism by which the voice is principally modulated. 

 a. The riraula glottidis in a state of relaxation. 

 b b. The thyro-arytenoid ligaments. 



