CONTENTS OF VOLUME IV. 



I. Erster Beitrag zur Insskten-Fauna von Sachalin. 



Von S. Mutsamura.: 1 



II. Studies on the Anatomy and Physiology of the Silk-Producing 

 Insects. 



L On the Structure of the Silk Glands and the Silk Formation in 

 Bombyx Mori. By Y. Tanaka 145 



III. Cytological Studies on the Nuclear Division of the Pollen Mother- 

 Cells of some Cereals and their Hybrids. By M. Nakao 173 



IV. Untersuehungen iiber die Sehadel der Japanischen Boviden. 



