—Dr. Curtis P. McCammon, director of Tennessee's Industrial Hygiene Service, writes to point out that the report of the House of Delegates' adoption of new standards for stating concentration of blood alcohol (Dec 8, p 36) contains "errors in the dropping of digits and negatives that approximate the errors in decimal placement decried by the committee."
The Dec 8 story inadvertently garbled the mathematical relation between the old method (percentage of alcohol by weight) and the new one (milligrams per 100 ml of blood) by quoting from the Board of Trustees' Supplementary Report E rather than from the corrected version presented to the House by its Reference Committee on Public Health and Occupational Health.
The statement should have read: "Under the new method of reporting, 0.05% becomes 50 mg [not 5 mg] per 100 ml and 0.10% becomes 100 mg [not 10 mg] per 100 ml."
The other error in