The solid phase of the Ehrlich ascites tumor in mice.

The Ehrlich mouse ascites tumor has become one of the widely used experimental cancers, par ticularly, as pointed out by Klein (6), in those studies dealing with quantitative aspects of tu mor biology. This tumor has been studied exten sively by a number of previous investigators. Loewenthal and Jahn (11) found that intraperitoneal inoculation with organ brei containing the Ehrlich carcinoma produced not only a carcinomatous peritonitis, but also an ascitic fluid rich in free neoplastic cells. These remained infec tive despite dilution and various types of deleteri ous treatment. The cytology of this fluid cancer has been described in Seeger's monograph (17),