Chemistry. — “On the Crystalforms of some Substituted Amides 
of Para-Toluenesulphonic Acid.” By Prof. EF. M. Jararm. 
(Communicated at the meeting of June 26, 1920). 
§ 1. In the following the results are communicated of an inves- 
tigation concerning the crystallographical properties of a series of 
substituted amides derived from p-toluene-sulphonic acid *), already 
prepared by Prof. Van Rompuren in 1902. These preparations, which 
in general occur in beautiful crystals, were ceded to me a long 
time ago by the said chemist for the purpose indicated; but the 
results of these measurements have not been published hitherto. 
To colleague van RompurGn’s benevolence [| am indebted also for 
some still lacking data on the specific weight of several of these 
substances. 
In the text occasionally attention has been drawn to some regu- 
larities of the erystalforms of these derivatives, which, from a che- 
mical standpoint, are closely related to each other; a review of the 
numerical data is, moreover, added to this paper at the end. Distinet 
relations in the erystalforms of these derivatives have, however, not 
been found in great number, notwithstanding their close chemical 
relationship. 
§ 2. I. Nitro-p-Toluene-sulpho-amide. 
This substance, which melts at 141° C., erystallizes from ethyl- 
alcohol in big, very transparent crystals, which often possess curved 
Fig. 1. Nitro-p-Toluene-sulpho-amide. 
1) Cf. also: P. van Rompurau, Proceed. Acad. of Sciences Amsterdam, Februari, 
(1902). 
23 
Proceedings Royal Acad. Amsterdam Vol. XXIII. 
