"His mind must be calm and placid as a summer's evening, and his body in an attitude of ease."
The Secret Revealed: or Animal Magnetism Displayed
<u>The Secret Revealed: or Animal Magnetism Displayed. A Letter from a Young Lady to the Rev. John Martin</u> The second edition, enlarged. ([London]: Printed for and sold by T. Hawkins, Borough, [1790?]). &lt;<a href="http://estc.bl.uk/T120461">Link to ESTC</a>&gt;