Illustration of two cross sections of a poor quality potato showing the 'small cortical layer and large thick internal medullary layer.'

Photograph of two sets of potato crops, one from sets that were badly scabbed (not boxed before planting) and the other from sets that were fairly clean (boxed before planting) showing the effect of scab on the growth and height of the plants. The experiment was done in 1914.

Photograph of men in a field farming potatoes on R H Ross's Farm in Collie in the early/mid 20th century.

Table illustrating the figures comparing Wolff's average standard with several constituents of common foods and their nutritive rations to show how there is a majority of vegetalbe foods have a marked deficiency in proteid and fat with a corresponding excess of carbohydrates.

Photograph of wart diseased potatoes both on the stalk and off with the root system below.