Ehrlich ascites cancer cells and MH134 cells were extracted with Deoxycholate(DOC) or 3MKCL. The antigenicity of these extracts was studied with the macrophage migration inhibitory test (MI-test), and the results can be presented briefly as follows: 1. The extract from DOC solubilized Ehrlich ascites cancer cells had about 50 times the antigenic titer of the extract from 3MKCL solubilized cells. 2. The extract from DOC solubilized MH134 cells had an antigenic effect at 500ug/ml but the extract from 3MKCL solubilized cells had no effect at any concentration. 3. These extracts were fractionated with Sephadex G-200 and the antigenic sites were determined with the MI-test.