These comprise:

1) 8 used ‘Hopkins and Biochemistry’ halftones and line blocks for illustrations with reference number 03975 (numbered 1-8 in 2 packages). This publication is ‘Hopkins and Biochemistry 1861-1947’ by Joseph Needham and Ernest Baldwin (Cambridge: W. Heffer and Sons, 1949).

2) 10 unused ‘Hopkins and Biochemistry’ halftones and line blocks for illustrations with reference number 03975 (numbered 9-18 in 4 packages)

3) 31 half-tones and line blocks for ‘The Pre-Natal History of the Steam Engine’ containing a delivery note from Heffers Printers Ltd., Cambridge dated 6 May 1976: ‘Halftones and line blocks we hold from article “The Pre-Natal History of the Steam Engine” Newcomen Transactions Vol XXXV. Missing halftones are Plates 1, 4, 5, 8.’ (line blocks numbered 1-18 in 1 package and plates numbered 2,3,6,7 and 9 in 1 package).