770 



The newly found molar is most likely a third genuine molar of 

 the left lower-jaw. It is much worn out by mastication, so that at 



the frontal side a few lamillas 

 have already disappeared. Extant 

 are still —\i,l2,v at 221X^8 

 X 1^7 mm. During the wearing- 

 out mastication there are formed 

 F^B- ^- on each lamina first a median, 



tape-shaped and two lateral, I'ing-shaped figures, which remain a 

 long time separated, but finally fuse into a distinctly rhombic figure, 

 so that the mastication-figures of two succeeding lamellas touch 

 each other in the middle, (fig. 1). The enamel is 2^^ — 3 mm. thick 

 and strongly plaited. The mentioned dimensions and characteristics 

 are all extremely typical for Elephas antiquus Falc. 



The molar was not much worn out and between the laminas it 

 contained still a little ferruginous quartz-sand and some small pebbels 

 of quartzite. 



Much less typical is the remnant of mastication of another molar, 

 belonging likewise most likely to El. antiquus. (fig. 2). 



It contains still 4 laminae of 55 X ^^ mm. 

 and is most likely a fragment of a first genuine 

 molar of the upper-jaw^ The very strongly plaited 

 enamel is 2 — 27-2 nim. thick. The figures of 

 maslication can hardly be called rhombic; we 

 must however take into consideration that these 

 Fig. 2. figures lose their typical character in the same 



measure as a molar is w^orn out by mastication. This fossil can- 

 not possibly belong to El. primic/enius ; on account of its narrowness 

 the molar shows the gi-eatest affinity with El. atiquus. 



Chemistry. — "On the nitration of metln/lurea." By Dr. H. J. 

 Backer. (Communicated by Prof. Franchimont). 



The behaviour of methylurea and of ethylurea on nitration is 

 considered as a remarkable instance of the different influence which 

 the methyl and ethyl group can exert on the properties of a compound.^) 



Degner and von Pechmann ') have stated that with methylurea the 

 nitration takes place at the ///^mo-nitrogen atom, whereas according 



1) Degner and von Pechmann, B. 30, 654 (1897). Also conipare V. Meyer 

 and Jacobson's Lehrb. d. Org. Chemie l^, 1394 (11)13). 



2) B. 30, 652 (1897). 



