Professor Palache described a new mode of occurrence of struvite in a recent number of this journal (vol. 8, No. 4, April, 1923, pp. 72-73). Another occurrence of the same substance was brought to my notice a short time ago. Some small crystals (about 1 mm by 3 mm) were handed to me for the purpose of identification. These had been found in the lungs of a subject dissected by Miss Chance (Department of Human Anatomy, University Museum, Oxford).