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Journal of Morphology Volume XX ;S 9. — per volume 



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Thejournal of Experimental Zoology Volume VII ^5.50 „ „ 

 The Study of the Causes Underlying the Origin of 



Human Monsters, 367 pages and 278 figures, by 



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The Journal of Experimental Zoology 



Contents of No. 2, Vol. 7, September 1909. 



Herbert W. Rand. Wound Reparation and Polarity in Tentacles of 

 Actinians. With Two Plates. 



C. M. Child. Factors of Form Regulation in Harenactis attenuata. III. 

 Regulation in "Rings". With Thirty-one figures. 



Thomas H. Morgan. A Biological and Cytological Study of Sex Deter- 

 mination in Phylloxerans and Aphids. With Twenty- 

 six figures and one plate. 



;; YERLAG VON WILHELM ENGELMANN IN LEIPZIG ;; 



Vorträge und Aufsätze über 

 Entwickelungsmechanìk der Organismen 



herausgegeben von 



Wilhelm Roux 



Soeben ist erschienen: 



Heft IX: 



Das VererMngsproblem 

 im Lichte der Entwic][lungsniecliaDil[ l)etraclitet 



Dr. Emil Godlewski 



Professor der Embryologie an der Jagelionischen Universität in Krakau 

 Mit 67 Abbildungen im Text. 16 Bogen 8'. Geheftet Ji 7.— 



