CONTENTS. 



Art. 1.— Frequency of After-Shocks and Space-Distribution of 



Seismic Waves. By S. Kusakabe. — Publ. March 2:")tli, I90G. 

 Art. 2.— Fossils from the Environs of Tokyo. {J nth 6 plates). By 



S. ToKUNAGA.— Publ. .July VMh, 1906. 

 Art. 3.— Theory of the Rainbow due to a Circular Source of Light. 



{IVtih Ô plates). By K. Aichi and T. Tanakdate.— Publ. May 



22nd, 1906. 

 Art. 4.— On the Change of Elastic Constants of Ferromagnetic 



Substances by Magnetization. ( With 7 plates). By K. Honda 



and T. Terada.— Publ. Oct, 4th, 1906. 

 Ai't. 5.— A Contribution to the Genus Fusulina, with Notes on 



a Fusulina-Limestone from Korea. {With 3 plates). By H. 



Yabk.— Pub]. Sept. 15th, 1906. 

 Art. 6. — Hydroxy lamine-«;3-Disulphonates (Structural Isomerides 



of Hydroximinosulphates or Hydroxylamine-/5j5-Disulpho- 



nates). By T. Haga.— Publ. Sept. 18th, 1906. 

 Art. 7.— On the Effect of Stress on Magnetization and its Re- 

 ciprocal Relations to the Change of Elastic Constants by 



Magnetization. {With ö plates). By K. Honda and T. Terada. 



—Publ. Dec. 15th, 1906. 



Art. 8. — On Three New and Remarkable Species of Echiuroids. 



{With 4 plates). By I. Ikeda.— Publ. Nov. 12th, 1907. 

 Art. 9.— Mesozoic Plants from China. {With 12 plates). By M. 



YoKOYAMA.— Publ. Dec. 18th, 1906. 

 Art. 10. — Acoustical Investigation of the Japanese Bamboo Pipe, 



Syakuhati. {With 3 j^lates). By T. Terada.— Publ. March 20th, 



1907. 

 Art. 11. — On the Gastrulation in Petromyzon. ( With 3 plates). By 



S. Hatta.— Publ. Oct. 15th, 1907. 

 Art. 12. — The Fucaceae of Japan. ( With 18 plates). By K. Yendo. 



—Publ. Oct. 15th, 1907. 



PRINTED AT THE " TOKYO TSUKIJI TYPE FOUNDRY.' 



