A Field of Celery
The picture gives a very good idea of the best method, or one of the best methods, of packing the celery with dirt for bleaching. The celery plant in its normal condition contains a mildly narcotic principle, and it is necessary to bleach it completely before it is fit for the table. The experiments that Mr. Burbank has made with the celery have been chiefly in the way of selective breeding, without crossing.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 7 Chapter 7