Sir William Henry Power's 1878 report to the Local Government Board opens with a specific complaint: Mr. Octavius Deacon of Loughton alleged that his infant's severe skin disease resulted from violet powder containing white arsenic. This complaint triggered an official inquiry into a 'special mortality' among infants in the Epping Rural Sanitary District. Power's investigation, conducted over two weeks in March-April 1878, combines medical interviews, chemical analysis, and epidemiological mapping. The report is notable for its methodical accumulation of circumstantial evidence, even as it acknowledges gaps in direct proof.

The Pattern of Illness and Death

Power documents 29 cases of a 'peculiar affection of the skin' among infants and children since early March 1877, with 13 deaths. The disease was initially mistaken for erysipelas. Mothers described a 'generally blackened condition of the skin' in the groins, pudenda, abdomen, armpits, and neck folds, often with swelling and hardness. Some cases showed 'little white blisters' or 'yellowish bladders.' The onset was simultaneous in multiple body parts. Power's tabulated evidence reveals that all six initial cases fell ill in early March 1877, with ages ranging from two to 20 weeks. Crucially, each had used violet powder from one of two local shops from birth, and several had procured a fresh packet just before falling ill.

The Chemical Evidence and Its Limits

Power submitted three powder samples to Dr. August Dupré for analysis. Dupré's report describes the powders as 'paler yellowish' and 'grittier' than ordinary violet powder, with a bulk weight 1.25 times greater. Microscopy revealed potato starch mixed with crystalline matter, including 'regular octahedra (arsenious acid).' Burning produced a 'very powerful arsenical odour.' Chemical analysis showed arsenious acid (white arsenic) constituted roughly half the weight: 50.34%, 51.40%, and 48.94% in samples A, B, and C respectively. Oxide of lead was also present (around 1%), along with other mineral matter. Power notes that the evidence linking the powder to the deaths is 'absolutely independent of the nature of the irritating agent,' emphasizing that the causal connection stands regardless of whether arsenic was the specific toxin.

Epidemiological Reasoning and Gaps

Power's investigation relies on tracing the temporal and geographic clustering of cases. He notes that the outbreak began abruptly in early March 1877, and that all affected infants had used violet powder from one of two shops. He argues that the exceptions—cases where a fresh packet was obtained just before illness—'strengthen the conclusion' that the powder became harmful only from late February 1877 onward. Power acknowledges that he cannot definitively prove the powder's contamination before that date. The report includes a detailed table of 29 cases, listing addresses, birth dates, attack dates, outcomes, and powder usage. Yet Power refrains from speculating about the source of arsenic in the powder, leaving that question unresolved. His conclusion is cautious: the evidence 'satisfy any reasonable doubt' about the connection, but he awaits Dr. Dupré's full report.

Power's report stands as a model of late-Victorian public health investigation: meticulous in data collection, restrained in inference, and attentive to the limits of forensic science. Readers should note how Power builds his case through multiple lines of evidence—clinical descriptions, chemical analysis, and epidemiological patterns—while openly acknowledging what remains unknown. The tabulated case list at the end offers a stark numerical summary of the tragedy, inviting scrutiny of each entry's details.