614 THE MICROSCOPE. 



seen the point of this organ spring out beyond the incision, 

 made as above described. Mr. Kobertson says, ' The dis- 

 covery of the function of the hyaline stylet is not merely 

 a new discovery, it is the discovery of a kind of instrument 

 as yet unique in physiology.' Now, although the function 

 of the stylet may be considered novel, the statement of the 

 fact of this object being in the foot of the Pholas cannot 

 be called ' a new discovery/ as it occurs also in Mytilus, 

 and, I believe, in almost all the bivalve mollusca." 



