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Several letters to the editor are presented in response to the article "Childhood Poisoning: The Promise and Abandonment of Primary Prevention," by Herbert Needleman in the 1998 issue.

A response by Herbert L. Needleman to letters to the editor about his article "Mercury in dental amalgam--a neurotoxic risk?" in a previous issue is presented.

The article presents a letter to the editor in response to the review of the history of the U.S. Environmental Protection Agency's response to the question of human testing of pesticides by David B. Resnick and Christopher Portier.

Presents a letter to the editor commenting on an article published in the periodical "Environmental Health Perspectives" concerning the issue of human experimentation.

Presents a letter to the editor about the industrial testing of toxic pesticides on human subjects.

The article presents a letter to the editor in response to the article "Should the Centers for Disease Control and Prevention Childhood Lead Poisoning Intervention Level Be Lowered," by S. M. Bernard in a 2003 issue of the "American Journal of Public Health."

A letter to the editor is presented in response to the article "Intellectual impairment in children with blood lead concentrations below 10 mcg per deciliter," by R. L. Canfield, et al in the 2003 issue.

Presents letters to the editors on occupational health issues. Comments on the update of the Brown and Jones study; Problems in environmental and occupational epidemiology; Criticism on the article 'Mortality experience of employees with occupational exposure to DBCP'; Insufficiency of data supporting the conclusion of Schneiderman.