Drawings, upper incisors from Arctomys pruinosus and Castor fiber by [W Wing] Plate 43, figures 13-15 showing sections of the upper incisors of an Arctomys pruinosus [Marmota caligata; hoary marmot] and a Castor fiber [Eurasian beaver]. Each figure is accompanied by a date, written in ink. Figure 13 is dated 2 January 1850, figure 14 is dated 3 January 1850, and figure 15 is dated 7 January 1850. Inscribed with figure, publication, and plate details. Not signed. Subject: Zoology Published in Philosophical Transactions as part of paper titled 'On the structure of the dental tissues of the order Rodentia' by John Tomes. Received by the Royal Society on 19 February 1850. Read 30 May 1850. January 1850