CONTENTS OF VOLUME IV. 



I. Erster Beitrag zur Insekten-Fauna von Sachalin. 



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 



m Cytological Studies on the Nuclear Division of the Pollen Mother- 

 Cells of some Cereals and their Hybrids. By M. Xaka«. 17:>> 



