PDF files of Plant Teaching Articles

[David R.Hershey]

I added another dozen teaching articles as PDF files including ones on
the following topics:

carbon dioxide deficiency
sponge seedlings
electrical conductivity
container soil physics
making plant biology teaching relevant
hydroponics

Here's the link: http://www.angelfire.com/ab6/hershey/bio.htm

Some of the files are rather large to maintain the quality of photos or
figures.

David R. Hershey