406 



3° le cellule muscolari seguono un decorso loagitudinale lungo i 



tubuli glandolari, ad ansa la ove quest! tubuli si terminano, 



mentre haono un decorso circolare, formandovi una nicchia, in- 



torno agli alveoli; 

 4° I'elemento muscolare liscio della prostata precede nello sviluppo 



quello glandolare; 

 5° la disposizione tipica riassunta nella terza conclusione e perfetta- 



mente in armonia collo sviluppo e colla funzione della prostata. 



Giunto al termine del mio lavoro sento il dovere di render le 

 piu vive grazie al mio illustre maestro, Prof. Lachi, per i consigli 

 e per 1' aiuto afifettuoso, che mi prodigo durante le mie lunghe ricerche 

 e di ringraziare pure I'egregio amico Dott. Ettore Piccoli, il quale 

 gentilraente si oflerse a riprodurmi dai preparati microscopici le figure 

 qui unite. 



Genova, Settembre 1895. (Eingegangen am 23. October.) 



Nachdruck verboten. 



Experimental Study of Meroblastic Vertebrate Eggs. 



(Preliminary Notice.) 



By K. MiTsuKUBi, 



Professor of Zoology, Science College, Imp. Univ., Tokyo, Japan. 



With one figure. 



In spite of the fact that the experimental method has now be- 

 come such an important feature of embryological investigations, no 

 attempt has, so far as I am aware, yet been made to extend the 

 same method into meroblastic vertebrate, eggs. Difficulties standing 

 in the way of carrying out such an idea would at first sight appear 

 almost insurmountable. A study on the burning question of the growth 

 in length of embryos which I have been carrying on for last few 

 months within the class of Reptilia made me, however, very desirous 

 of putting a long cherished notion into practice and of making an at- 

 tempt at least in the direction above indicated. Accordingly during 

 the breeding season just past of Clemmys and Trionyx, I have been 

 making a series of experiments on the eggs of these animals somewhat 

 after the manner so successfully carried out by Roux, Hertwig, Morgan 

 and others in Ichthyopsidan eggs. The results, while not realizing my 

 sanguine expectations, have at least established the fact that 

 an experimental study of meroblastic eggs is possible. 



