12 Art. 2 —Y. Shibata. and T. Maruki : 



the complex ion [Co(NH2)2(N02)l'C204] ' is constructed asymmetri=- 

 cally, which, means that the two ammonia molecules in this 

 complex ion occupy the adjacent spacial position. As to the two 

 nitro-groups, their position was previously determined, by one of 

 the authors (Shibata), by a spectroscopic study. 



5. The molecular asymmetry of the above mentioned 

 complex ion, which is the first example of a mesotomised complex 

 anion containing a cobalt atom, belongs to a new type and has 

 been introduced into the stereochemistry of the metal complexes, 

 calling it the type of molecular asymmetry III, in extension of 

 Werner's classification. 



The senior author, Yuji Shibata, has profound sorrow in re- 

 cording here the death of his collaborator Mr. Toshio Maruki,. 

 Rigahushi, which occurred during the progress of the investigation 

 recorded in this paper. At the same time, he has much pleasure 

 in expressing his hearty thanks to Messrs. K. Matsuno, Rigakushif, 

 and S. Mitsukuri for the great assistance they have given him in 

 completing this work. 



Published November 30, 1917. 



