1 84 French Kational Jvsfihite. 



ralists or anatomists in England, upon the manner in which 

 these tdelh are shed and replaced, M. Tenon has presented 

 to the class the work he has edited upon the same subject 

 for more than twenty-five years, which contains a great part 

 of these observations. 



Distinctly acknowledging the priority legitimately due to 

 this excellent anatomist, the class regret that he has so long 

 deprived the public of his discoveries, and have earnestly en- 

 treated him to publish them. 



M. Tenon is on the point of publishing another work 

 upon the eye and its diseases. He has made several new- 

 remarks upon the parts which surround this organ : he has 

 found, for instance, some trndinous lun:ps which tic tlie 

 straight muscles to the anterior edges of the orbit, and serve 

 them for a kind of returning pulley, and hinder them from 

 compressing the eve-ball; he has developed a membranous 

 tunrc which surrounds the eye-ball, attaches it to the two 

 angles of the orbit by two kinds of wings, passes into the 

 pupils, and is there reflected behind the tarsi; and lastly, 

 gives a passage to the tendons of the muscles. Other ana- 

 tomists confound this tunic with the cellaconte : he disco- 

 vered small ligaments which join the extremities of the tarsi 

 to the orbit ; he has examined the effect of the various che- 

 mical substances upon the crystallines : lastly, he has esta- 

 blished a new opinion upon the agents which transmit to 

 the iris the action of the retina, and by which the impres- 

 sions received by the latter dilate or contract the other. 

 M. Tenon searches for these agents in the ciliary processes, 

 the tongues of which are prolonged behind the iris, and the 

 tails of them touch the retina. 



This indefatigable anatomist has also given us some 

 account of the inalconformation commonly called hare- 

 lip. He has found it sometimes proceeding from a rent of 

 one of the two maxillary bones, sometimes from a rent in 

 both ; and he attributes the cause of it to a disproportionate 

 dilatation of the tongue. Sometimes he found the palate 

 divided behind, and it wiis then a too rapid increase of the 

 brain which produced the evil. Children born without a 

 tongue, or such as had lost it early by the small-pox, had. 



