This folder contains accounting sheets showing comparative monthly operating expenses at West Orange laboratory and Silver Lake, New Jersey. The expenses are listed in twenty-six categories, including labor, utilities, and other forms of overhead. Two documents have been selected: (1) a summary of cumulative expenses by department for the period January-August 1919; and (2) a summary of overall expenses by month for the entire year.

Approximately 5 percent of the documents have been selected. The unselected statements show departmental expenses for single months, as well as comparative expenses across several months for some departments.