Heating the duchess's bath water, and a seated man
A note on tempering water with three parts hot to four parts cold, above a seated figure
A short practical memorandum headed 'Bath' explains how to warm the water for the Duchess's bath-stove by pouring three parts of hot water over four parts of cold. Below the note Leonardo sketched a man seated in profile, possibly a friar, leaning with one hand on his knee. Faint circles and ruled lines of an earlier geometric study show through the lower part of the sheet.
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Note for heating the Duchess's bath
A practical reminder headed 'Bath': to warm the water of the Duchess's bath-stove, hot and cold water are to be combined in a fixed measure. The jotting reads as a memorandum of court daily life.
Three parts hot to four parts cold
The warming is given as a proportion: take three parts of hot water over four parts of cold water. The instruction fixes the temperature by a simple ratio of quantities.
Seated man, perhaps a friar
A man is drawn seated in three-quarter profile, one hand resting on his knee and the other raised toward his face. The rapid pen sketch studies pose and drapery rather than portrait likeness.