MYELOID CELLS IN CEREBROSPINAL FLUID BY

The cells of cerebrospinal fluid are usually ex-amined in a Fuchs-Rosenthal chamber using a nuclear stain. By this means it is possible to dis-tinguish between polymorphonuclear leucocytes and lymphocytes, but difficulties arise when other types of cell are predominant. If films can be made of a quality comparable with that expected for haematological diagnosis, various other cell types are found. Besides neutrophil polymorphonuclears and small lymphocytes, one sees many cells of the lymphoid and plasma cell series, eosinophils, occasionally basophils, and a variety of monocytoid cells and macrophages (some of which may possibly be derived from the lepto-meninges). For illustrations the reader is referred t