( 4:^G ) 



Usage, to (lenole also in Diildi llié l-fiJ^^Uillhu- Scji'icfcf l»v means of 

 the term schist (pi. sc/n'stcii) hon-ow cd tVom the (Ireek, and to coiitiue 

 one's self in the application of the (le^i^•e(l adjective .sYj///.v/r^//.v and the 

 snbstantive schistositeit exclnsivelv to this class of metamorphosed rocks. 

 Wliile, in conclusion, I express my special uratitiide to l*rof. 

 J. W. Muller I'oi- his kiiidly fiii'iiished conlrilnilions and for some 

 valuable hints, I cannot omit tendering my best thanks to Prof. 

 A. WicHMANN and Prof G. A. F. MoLKN(iir\AFF for their lively interest 

 and the sn})port with which they obliged me. 



Chemistry. — "(>/; the qiu'stion <is to the nt/sct/jiliti/ dud the form- 

 analoyii in (OvtiKitic Nitro- mtd yitroso-cowpotinds'". \U 

 Dr. F. iM. Jak(;kk. (Commuincated by Prof. A. P. N. Fhanchimont). 



1. The following communication contains a furthei- contribution to 

 the kowledge of the mutual behaviour of the aromatic nitro- and nitroso- 

 derivatives, of which several j)articulars were given ])reviously. The 

 entire niiscib ility in the solid condition, and the form-analogy bordering 

 on isomorphism, were established '\\\ ilw va^c oi' p-Xitro- and /i-X/fi-oso- 

 diethijhiiiiruie '), while afterwards, in a more extended paper of a 

 more general nature -), the mutual comparison of p-Nitro- and p- 

 Nitrosophciiol and of o-Xitroso- and o- Dinitrohpitzcw was discussed. 

 It then appeared that no (iciwrdl rule could be laid down as to the 

 connection of the two classes of compounds. 



A new pair of similar comparable substances which are interes- 

 ting from more than (^y/^' point of \iew, namely r'-AV/yo- and ('-AV/ro.vo- 

 dcetaitilidi' were now studied. The result was diHerent from that 

 obtained with jhXitro- and p-Xit.rosodiednjhniUiiic although analogy 

 is j)i-esent in one of the axial relations, and a solid solution of the 

 two components ajipears to l)e possible to some slight extent. 



§ 2. Ortho-Nitro-Aceto-Anilide. 



C„H, (NO.,) .N ll.COCH,: meltingpoint : 87^ C. . 



(2) (1) 



V\^. 1. 



1) F. M. Jaegkr, These Proc. VII, p. 600, 



2) idem, Ueber Mischbatkcit von festcn Phasen, Z. f. Kryst. 42, 230— i27G (1906) 



