Biological products. Regulation of sale of viruses, serums, toxins, and analogous products, etc., hearings before subcommittee on H. R. 5845, H. R. 7366, and H. R. 8618, bills to amend sec. 2 of act to regulate sale of viruses, serums, toxins, and analogous products in District of Columbia, to regulate interstate traffic in said articles, and for other purposes, Feb. 21-May 6, 1924.