Newton found that everyone was colour blind! : The routine urine information system, Bili-Labstix + Urobilitstix.

Advertising card issued by Ames Company (a division of Miles Laboratories Ltd), for Clinitest and Clinistix, information systems for patients with diabetes, with return postage option attached. Showing an illustration from 'An Illustrated History of Science' by Dr. F. Sherwood Taylor.