Laboratory notes taken by Clara Esther Hartley

The notebook details approximately 115 experiments performed by Hartley, ranging from fundamental investigations such as "Is Wood an Element?" to more advanced concepts dealing with the production decomposition, and solubility of carbon dioxide. Notably, miscellaneous notes at the end of the volume include an analysis of drinking water drawn from the well of a local resident. In her analysis, Hartley notes sources of pollution and finds traces of chloride and nitrates in excess of 425 mg, leading her to conclude "This water is to [sic] foul to be used for drinking.".