“…The principles of microdensitometry have been reviewed by Dainty and Shaw (1974), complete with bibliography. Recent papers describing the design of advanced microdensitometer systems include those by Grimes (1971), Swing (1972Swing ( , 1973, Kinzly (1972, 19473), Kofsy et a2 (1972), Reynolds and Smith (1973), Cronin and Reynolds (1973), Fallon (1!273), Miller et al (1973), Johansson and Biedermann (1974b) and Biedermann and Johansson (1975).…”