CONTENTS. 



PART I. 



Page 

 ART. I. On the Circulation of Sap in Plants. By Dr. HERMANN 



HOFFMANN 1 



ART. II. Upon the Male of Argonauta Argo and the Hectocotyli. 



By Professor HEINRICH MULLER of Wiirzburg 52 



ART. III. A few Remarks upon Hectocotylus. By C. TH. VON 



SIEBOLD, Professor at the University of Breslau 92 



ART. IV. Investigation of the Question : Does Cellulose form 

 the basis of all Vegetable Membranes? By HUGO VON 

 MOHL. 95 



PART II. 



ART. IV. Investigation of the Question : Does Cellulose form 

 the basis of all Vegetable Membranes ? By HUGO VON 

 MOHL (continued) 97 



ART. V. Memoir upon the Hectocotyli and the Males of certain 



Cephalopods. By MM. J. B. VERANY and C. VOGT. ...... 119 



ART. VI. Organographical Observations on certain Epigynous 



Monocotyledons. By H. CRUGER, of Trinidad 155 



ART. VII. Fragments relating to Philosophical Zoology. Se- 

 lected from the Works of K. E. VON BAER . . 1 70 



