316 LETTERS ON NATUKAL MAGIC. 



placed, the other, or the external edge, being serrated liko 

 that in the cavities of the feet of the Gecko. The two 

 rows are separated by a thin ligamentous partition, and 

 the plates being raised or depressed by the voluntary 

 mucles form so many vacua, by means of which the adhe- 

 sion of the fish is effected. 



These beautiful contrivances of Divine Wisdom cannot 

 fail to arrest the attention and excite the admiration of 

 the reader ; but though there can be little doubt that they 

 are pneumatic suckers wrought by the voluntary muscles 

 of the animals to which they belong, yet we would 

 recommend the farther examination of them to the atten- 

 tion of those who have good microscopes at their command. 



