Letter | Published:

Frequency Curves of Genera and Species

Nature volume 114, page 10 (05 July 1924) | Download Citation



IN NATURE for June 7, Mr. Tate Regan refers to “the series x, x/2, x/3, x/4, etc. x/x, representing the number of genera with 1, 2, 3, 4, etc. species in a group where the sizes of genera are purely a matter of chance.” I am unable to attach any definite meaning to the phrase “are purely a matter of chance,” since the sizes might be “a matter of chance” in many different ways, and I do not see what process Mr. Tate Regan has supposed to be followed. Will he be so good as to state exactly in what way he supposes the systematist to operate, and to show how the series in question arises from his operations?

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.

Author information


  1. St. John's College, Cambridge, June 10.

    • G. UDNY YULE


  1. Search for G. UDNY YULE in:

About this article

Publication history





By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.