The occurrence of lipomas within the central nervous system is sufficiently uncommon that most cases have stimulated considerable attention. These lesions have been encountered both in the spinal canal and within the cranium. Ehni and Love1 have reviewed the literature on intraspinal lesions and present a detailed discussion of the problem. They include data on 29 cases of intradural and 20 cases of extradural lipomas. Lipomas of the brain are somewhat more numerous, and about 110 cases have been reported. These have occurred in the following areas, in this order of frequency: the corpus callosum, the ventral aspect of the diencephalic structures, the choroid plexus of the lateral ventricles, and the dorsal aspect of the midbrain. Except for the lesions in the corpus callosum, these tumors are ordinarily of little importance and were frequently encountered incidentally at autopsy. In the corpus callosum, however, lipomas were frequently sizable and were often associated with defects in the development of the corpus callosum. A good review of the subject of lipomas of the corpus callosum was contrib¬ uted in 1946 by List and associates.2 They recorded data on 30 cases from the literature, including 2 of their own. Our purpose is to compile information on additional cases re¬ ported since then and to report in detail a case with several unusual features recently

Identification, total and differential counts of cell populations in guinea pig colostrum, milk and involution secretion were carried out. The cellular concentration in colostrum was high, but there was a dramatic decline in milk collected at the peak of lactation. Advancement of mammary gland involution was associated with a dramatic increase in cellular concentration. The neutrophil was the predominant cell type in colostrum, milk and early involution secretion. Macrophages were present at all stages of lactation and became the predominant cell as involution advanced. The proportion of lymphocytes was low and remained constant throughout the various stages of lactation. Small numbers of eosinophils and epithelial cells were present in most of the samples examined.