96 



Statistikern, Geographen, und Palaeontologen eine wissenschaft- 

 liche Frage oder Disciplin zu fördern. Er gedenkt bei dieser 

 Gelegenheit Shelford's, der viel über Blattiden veröffentlicht 

 hat und vor wenigen Wochen verstorben ist. — Die Mitglieder 

 der Sektion ehren sein Andenken durch Erheben von den Sitzen. 



J. VAN Bemmelen asked if Mendelian research would not 

 lead to clearer results, as it was obvious that the form and size of 

 the wings depended on certain units present from remote times. 



C.J. Gahan remarked that the Blattidce did not lend them- 

 selves well to Mendelian research, owing to the length of time 

 they individually took to reach maturity. 



T. A. Chapman then read his paper on : 

 Some Experiments on the Regeneration of the Legs 



OF LiPARIS DISPAR. 



The lecturer described his experiments on the results to the 

 imago of amputating portions of the appendages of the larvae of 

 L. dispar and A. pronuha, and stated that he had found anaes- 

 thesia produced by drowning caused much less inconvenience 

 to the subject than chloroform. Numerous photographs were 

 shown depicting the results of the experiments, and the following 

 conclusions were drawn : 



(i) That unless a very radical removal of the leg had been 

 made, regeneration always took place. Variation in the results 

 in different instances of the same injuries at the same stage might 

 be due to a difference in vital stamina, to some local injury 

 accompanying the operation, or to some abortive septic attack 

 which had the effect of merely weakening the tissues involved. 



(2) There was always some effort at regeneration, but its 

 completeness depended largely on the number of moults after 

 the injury. 



(3) Regeneration was simple after a clean amputation, but 

 branching or duplication might result from crushing of the part. 



(4) Regeneration was much more rapid in some species than 

 in others (cf. Vol. II., p. 295). 



Discussion. 



P. Speiser said he wished to convey to Dr. Chapman the 

 thanks of the meeting for his interesting and laborious investiga- 



