I.
FIRST PART.—MAN.
LETTER III.
LETTER IV.
LETTER V.
LETTER VI.
LETTER VII.
LETTER VIII.
LETTER IX.
LETTER X.
LETTER XI.
LETTER XII. THE CHYLE.
LETTER XIII.
LETTER XIV.
LETTER XV.
LETTER XVI.
LETTER XVII.
LETTER XVIII.
LETTER XIX.
LETTER XX.
LETTER XXI.
LETTER XXII.
LETTER XXIII.
LETTER XXIV.
LETTER XXV.
LETTER XXVI.
LETTER XXVII.
LETTER XXVIII.
PART SECOND—ANIMALS.
LETTER XXX.
LETTER XXXI.
LETTER XXXII.
LETTER XXXIII.
LETTER XXXIV.
LETTER XXXV.
LETTER XXXVI.
LETTER XXXVII.
LETTER XXXVIII.
LETTER XXXIX.
LETTER XL.
POSTSCRIPT.
