19G 



TRANSACTIOXS OF THE 



[march 15, 



It has been a matter of sui-i)rise tliat no series intermediate 

 between the open chains of the paraffin group and the closed 

 ring of the benzene group have been made known. Quite re- 

 cently, W. II. Peikin, Jr./" in a remarkable memoir, has begun 

 to fill up this wide gap, and he describes many bodies containing 

 a three-carbon atom ring, a four and a five-carbon atom ring. 

 The series of possible methylene-addition products is shown in 

 the following schedule: 



For details concerning derivatives of the above series, and the 

 remarkable properties of some, we must refer to Perkin's pub- 

 lished papers. 



Professor Victor Meyer" has, within a few montlis, liegun 

 to investigate the possibility of obtaining closed chains contain- 

 ing a greater number of chains than six. He points out that, 

 with the exception of tlie double rings, such as anthracene and 

 acridine, only two bodies were known having seven links in a 

 ■closed chain, viz. : 



Professor Meyer, liowever, obtained bodies having nine and 

 twelve links in closed chains, as indicated below. 



