Sketchbook 1928: West Wind Relief p.[41]. The reference to Masaccio concerns the central panel of the Pisa polyptych, Madonna and Child with Angels of 1426. See also HMF 79(107), 79(117). A sheet has been attached to the page 225 x 151mm with a recto drawing Three Flying Figures 1928 in pencil, chalk, wash and a verso Half-Figure 1928 pencil, chalk, wash and an inscription: pencil top of page Make architectural experiments./Big form (Remember Massaccio (sic) in Nat. Art. Col. Fund).