( 23) 



in the heated sodium phenylcarboiiate, and as no disodium-salicylate 

 has been found it cannot liave been caused by the formation of 

 that compound. 



I have not been able to hnd the lookcil for additive product ; 

 perhaps it has been decomposed by acetone in the same manner as 

 sodium phenylcarbonate. The results obtained show in my opinion 

 that the formation of saHcylic acid from sodium phenylcarbonate is 

 not so simple as is generally imagined. 



A more detailed account of research will appear in the "Recueil". 



Chemistry. — ''On the cnj stal- forms of the 1,^-DinitroanUine-den- 

 vatlves, substituted in the ^R^-(/roup\ By Dr. F. M. Jaegkr. 

 (Communicated by Prof. P. van Romburgh). 



(Communicated in the meeting of April 27, 190G). 



More than a year ago I made an investigation as to the form- 

 relation of a series of position-isomeric Dinitroanilme-derivaüves ^). 

 On that occasion it was shown how these substances exhibit, from 

 a crystallonomic point of view, a remarkable analogy which reveals 

 clearly the morphotropous influence of the hydrocarbon -residues, 

 substituted in the Nf^I.^ -group. 



Among the compounds then investigated, there were already a few 

 1-2-4:- Dinitromiilhie-oevwaiives kindly presented to me by Messrs. 

 VAN Romburgh and Franchimont. Through the agency of Prof. 

 VAN Romburgh and Dr. A. Mulder, I have now received a series of 

 other derivatives of 2,4-DmitroaniUne which in the happiest manner 

 complete my former publications. I wish to thank these gentlemen 

 once more for their kindness. I will describe and illustrate all these 

 derivatives in a more detailed article in the Zeits. f. Kryst. 



For the present I will merely give a survey of the results obtained, 

 which have been collected in the annexed table. 



I have chosen such a form-symbolic, that the morphotropous rela- 

 tion of the great majority of these substances is clearly shown. They 

 all possess the Same family-character which is shown in the values 

 of the axial relations and the topic parameters. Only a few" of these 

 substances show no simple relationship with the other ones. 



1) Jaeger, Ueber morpholropisclie Beziehungen boi den in der Aniino-Gruppe 

 substituierten Nitfo Anilinen; Zeils. f. Krysl. (1905). 40. 113— V-G. 



