Most persons are familiar with the fact that some plants are much more easily affected by frost than others. The slightest frost will affect plants like Pussly, young corn, beans, twitch grass, tomatoes, squashes, pumpkin, etc. I have watched many plants for some years, but the opportunity of recording temperature in close proximity to the plants have not heretofore been made here, though doubtless some observers have recorded facts, but the references are not at hand. Up to November 4 the following observations were made. In these tables dates and temperatures are recorded only at 32 degrees and below.
Proceedings of the Iowa Academy of Sciences
©1892 Iowa Academy of Science, Inc.
Pammel, L. H.
"The Relation of Frost to Certain Plants,"
Proceedings of the Iowa Academy of Science, 1(Pt. 3), 77-79.
Available at: https://scholarworks.uni.edu/pias/vol1/iss3/21