Protein Survey Map

While looking for unrelated items I came across this 1920's Protein Survey Map of Western Canada.

Wondering what any of this means, I did some research and discovered that protein refers to the gluten content of wheat. In the early 1900's flour mills began classifying their wheat based on protein content with premiums offered for the highest protein flour.

The map follows along the railroad lines because rail cars were tested for gluten content. The color scheme of this map is hard to follow but red is the highest protein content followed by blue. 

The map credits the chemists in addition to the Trade and Commerce Department minsters. I lost the original source of the above map but found this map from a few years later

with an even more detailed and confusing color scheme.

Here is the title block.
 

In a previous post I highlighted the Alphabet Railway. Here is a piece of that, with a few interruptions for pre-existing towns.

See the whole map here.