Since Froin's1 classical studies on xanthochromia in 1903, much has been added to our knowledge of yellow spinal fluid, both as to its chemical and cytologic contents, and the varied conditions under which it may be encountered. Sprunt and Walker,2 in 1917, analyzed 100 reported cases and added five personal reports. From their conclusions it would seem wise to divide xanthochromatic spinal fluids into two classes which, given in their own words, are as follows:
1. Those in which the color is due to dissolved hemoglobin or its derivatives, and which, as a rule, do not coagulate spontaneously and contain only a small amount of globulin. Such fluids usually are associated with brain tumor in contact with the meninges or the ventricles.
2. The larger and more important group comprises those cases showing the so-called Froin's syndrome, in which the fluid is transparently clear, yellow, coagulates spontaneously, contains