Email Record: Regulations for control of manufacture, importation, and sale of arsphenamine, and its derivatives neoarsphenamine, sodium arsphenamine, silver arsphenamine, neosilverarsphenamine, phospharsphenamine, and sulpharsphenamine, referred to collectively as "arsphenamines"; supplementary to Regulations for sale of viruses, serums, toxins, and analogous products, approved Aug. 1, 1923.