CONTENTS OF VOLUME IV. 



I. Erster Beitrag zur Insekten-Fauna von Sachalin. 



Von S. Mutsumura 1 



n. studies on the Anatomy and Physiology of the Silk-Producing 

 Insects. 



1. On the Structure of the Silk Glands and the Silk Foimation in 

 Bombyx Mori. By Y. Tauaka 145 



