1. 'The;CANNON, W.B.; ROSENBLEUTH, A.,1949
2. Brit;LEWIS, T.;med. J7,1932
3. LEWIS, T., and PICKERING, G. W. (1934), Clin. Sci., I, 327.
4. DE BAKEY, M., and SIMEONE, F. A. (1946),Ann. Surg., 123,534. DORNHORST, A. C., and SHARPEY-SCHAFER, E. P. (ig51), Clin. Sci., 10, 37I. ECKSTEIN, R. W., GREGG, D. E., and PRITCHARD, W. H.
5. HUGHES, A, F. W, (1935), 7. Anat. Lond., 70, 76.