Emphasis on Mathematics.

Radioactivity in Thyroid Glands Following Nuclear Weapons Tests: L. Van Middlesworth . ........................................... 982 Gum Replica Technique for Electron or Light Microscopy: G. E. Hess and E. J. Schantz ...... .............................. 983 Action of p-{Di(2-chloroethyl) }-amino-L-phenylalanine of HardingPassey Mouse Melanoma: J. M. Luck ..... ........................ 984 Increased Frequency of Births in the Morning Hours: P. D. King ... ..... 985 Adrenal Cortex and the Parotid Secretion of Sodium-Depleted Sheep: J. R. Goding and D. A. Denton ...... ............................ 986 Cholinesterase Activity of Human Leucocytes: G. H. Denny, Jr., and D. D. Hagerman ..... ...................... 987 Clinical Experiment on the Use of Sodium N-Lauroyl Sarcosinate in the Control of Dental Caries: L. S. Fosdick ..... ....................... 988 Demonstration of Particulate Adhesion of the Rieckenberg Type with the Spirochete of Syphilis: C. Lamanna and D. H. Hollander ..... 989 Duttonite, New Vanadium Mineral from Peanut Mine, Montrose County, Colorado: M. E. Thompson, C. H. Roach, R. Meyrowitz ... ......... ggo Lack of Recognition of Foreign Works: R. C. Mitchell .... ............. g9o Serum Protein Concentrations in the North American Negroid: H. M. Rawnsley, V. L. Yonan, J. G. Reinhold .... .................. 991 Green Crabs and the Redistribution of Quahogs: J. M. Moulton and A. H. Gustafson ..... .......................... 992 Serotonin-Releasing Activity Limited to Rauwolfia Alkaloids with Tranquilizing Action: B. A. Brodie, P. A. Shore, A. Pletscher ... ...... 992