While the investigation of the freezing-point of sulphur, described in these Proceedings (vol. xxiv. p. 299), was in progress, some experiments on the maximum quantities of amorphous sulphur, formed at various temperatures from 130° to 448°, were being made. The results showed remarkable irregularities. It was also found that the addition of foreign bodies, which are for the most part without chemical action on sulphur, greatly magnified these disturbances, and led to the discovery of their source. The following is a condensed statement of the principal facts.