738 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 1. Formation of crystals starting from a crystalline nucleus and de- veloping in rings. This is a rather frequent phenomenon in crys- tallization. 2. Spadally nonhomogeneous reduction of volume producing wrinkles. (h) An entirely different problem, that of liquid fatty exudates, is presented below: For this study, suppositories were prepared from the following mixture: Transester Suppocire C--Polyglycol (M2130)* ................. 50 g. Glycerol monostearate (Geleol) .............................. 10 g. Propyleneglycol monostearate (Monosteol) ..................... 40 g. Printex U carbon black* ..................................... $ g. ø11" Figure 18.--Dilatometric curve (augmentation du vol. = Increase in volume heures = hours). Figure 19.---Liquid exudate (12X). Figure 20.---Solidified exudate (12X). The melting point of this mixture (U-tube method) is 36.6øC, and its expansion curve at 28øC is shown in Fig. 18. An increase in volume of ap- proximately 0.35% is observed. Observation of samples stored in hermeti- cally sealed flasks reveals no change after 5 hours after 5• hours, some liquid exudates appear on the surface of the suppository after 21 hours, the exuded liquid accumulates in transparent droplets (Fig. 19). However, *Cf. Appendix I.

THE STUDY OF SURFACE ANOMALIES OF FATTY SUBSTANCES 739 Figure 21.--Dilatometric curve (noir de carbone = carbon black heures = hours diminution du volume en % = % contraction of volume). Figure 22.--Appearance of freshly pre- pared Suppocire A-containing suppository Figure 24.--App. earance of Suppocire A- containing suppository after tempering at 29øC followed by four months' storage at room temperature (12X). Figure 23.--Appearance of Suppocire A- Figure 25.--Appearance of suppository containing suppository after 500 hours containing C•0-acid mono- and diglyceride storage at 25øC (12X). and Suppocire A (12X).