In three parts, vol. 2 containing pt. 2 and 3. Part 2 has the half-title:..."A catalogue of diseases distributed into natural classes according to their proximate causes, with their subsequent orders, genera and species, and with their methods of cure"; Part 3..."The articles of the materia medica, with an account of the operation of medicines."
Section XL. On the ocular spectra of light and colours by Dr. R. W. Darwin...from the Philosophical Transactions, vol. LXXVI [1786] p. 313.