Drawing, lens of elephant by [Robert Kaye Greville] Plate 6, number 4, figures 5-6 showing two views of the surfaces of the lens of the elephant, showing three septa diverging from poles of the lens. Inscribed with publication and plate details. An ink inscription below figure 6 reads 'Fig. 6 to be copied from Fig. 5 Inverted'. Not signed. Watermarked 'J Whatman 1834'. The manuscript for this paper is wanting. Subject: Zoology / Physics Published in Philosophical Transactions as part of paper titled 'On the anatomical and optical structure of the crystalline lenses of animals. Continued from a former paper (Phil. Trans. 1833, p. 332.)' by David Brewster. Received by the Royal Society on 26 November 1835. Read 21 January 1836. [1835]