O 4, QUARTERLY CHRONICLE OF MICROSCOPICAL SCIENCE. 
Gasser is in agreement with Waldeyer (Eierstock and Ei), 
who is also followed by Balfour and Foster in their work on 
the Chick, noticed above; but Gasser differs from these 
authors in denying the junction at any time of the Millerian 
and Wolffian ducts. 
Sernoff (‘Centralblatt,’ June 27) agrees with Bornhaupt 
in considering that the duct of Muller (in the Chick) is 
formed by a simple involution from the pleuro-peritoneal 
cavity, which grows backwards in the mesoblast, between the 
Wolffian duct and the germinal epithelium ; and thinks that 
Waldeyer is in error in supposing the involution to be in the 
form of an elongated furrow. Balfour expressed a similar 
view as to the mode of formation of the Miillerian duct in 
dog-fish (this Journal, October, 1874). 
