Published in Works, vol. 14, pp. 75-87. For the overlapping Porosity passage, see Works, vol. 10, pp. 121-2.
Fols. 29-45 (17 leaves)
Unpublished MS entitled `Notes upon the 27th Section': endorsed (fol. 45) `About Pores and Figures'. Includes early version of passage about the Earl of Mount-Alexander in`Porousness of Animal Bodies' in Porosity; (fol. 40v).