[Footnotes]

[Footnotes]
*
An abridgment of a paper presentedl as a part of the program of The National Associa- tion of Biology Teachers meeting in Phila- delphia, Dec. 29
part of the program of The National Association of Biology Teachers meeting in Philadelphia, Dec. 29
*
An abridgment of a paper presented as a part of the program of the annual conven- tion of The National Association of Biology Teachers in Philadelphia, Dec. 29
part of the program of the annual convention of The National Association of Biology Teachers in Philadelphia, Dec. 29
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