<!DOCTYPE html><HTML lang="en"> <head><meta charset="utf-8"> <title>Kahane (Howard) - Thomason on Natural Kinds (Theo Todman's Book Collection - Paper Abstracts) </title> <link href="../../TheosStyle.css" rel="stylesheet" type="text/css"><link rel="shortcut icon" href="../../TT_ICO.png" /></head> <BODY> <CENTER> <div id="header"><HR><h1>Theo Todman's Web Page - Paper Abstracts</h1><HR></div><A name="Top"></A> <TABLE class = "Bridge" WIDTH=950> <tr><th><A HREF = "../../PaperSummaries/PaperSummary_07/PaperSummary_7401.htm">Thomason on Natural Kinds</A></th></tr> <tr><th><A HREF = "../../Authors/K/Author_Kahane (Howard).htm">Kahane (Howard)</a></th></tr> <tr><th>Source: Nous, 3, No. 4. (Nov., 1969), pp. 409-412</th></tr> <tr><th>Paper - Abstract</th></tr> </TABLE> </CENTER> <P><CENTER><TABLE class = "Bridge" WIDTH=400><tr><td><A HREF = "../../PaperSummaries/PaperSummary_07/PaperSummary_7401.htm">Paper Summary</A></td><td><A HREF="#ColourConventions">Text Colour-Conventions</a></td></tr></TABLE></CENTER></P> <hr><P><FONT COLOR = "0000FF"><U>Philosophers Index Abstract</U><FONT COLOR = "800080"><ol type="1">This paper argues that: (1) richmond thomason's criteria (nous, 3,95-101 peb 69) of <a name="1"></a><A HREF="../../Notes/Notes_0/Notes_27.htm">natural kinds</A><SUP>1</SUP> are not satisfactory as criteria of scientific classification, because his criteria forbid overlapping kinds, except where one kind is a species of another; yet many legitimate scientific kinds overlap in this forbidden way (e.G. Beryl silicates overlaps chromium silicates, and male primates overlaps homo sapiens). (2) His claim that his classification system is modular seems to be in error. (3) He seems confused in general concerning <a name="2"></a><A HREF="../../Notes/Notes_0/Notes_27.htm">natural kinds</A><SUP>2</SUP>, essences, and necessity. In particular, his claim that if f is a <a name="3"></a><A HREF="../../Notes/Notes_0/Notes_27.htm">natural kind</A><SUP>3</SUP>, then (x)(fx fx), i.E., "Predicates expressing <a name="4"></a><A HREF="../../Notes/Notes_0/Notes_27.htm">natural kinds</A><SUP>4</SUP> have the property that anything possessing them possesses them necessarily", seems confused. Perhaps thomason meant that if f is a property essential for membership in a kind k, then (x)((x k) fx), which, if essential properties are defining characteristics, is true but utterly trivial.</ol></FONT><FONT COLOR = "0000FF"><HR></P><a name="ColourConventions"></a><p><b>Text Colour Conventions (see <A HREF="../../Notes/Notes_10/Notes_1025.htm">disclaimer</a>)</b></p><OL TYPE="1"><LI><FONT COLOR = "0000FF">Blue</FONT>: Text by me; &copy; Theo Todman, 2018</li><LI><FONT COLOR = "800080">Mauve</FONT>: Text by correspondent(s) or other author(s); &copy; the author(s)</li></OL> <BR><HR><BR><CENTER> <TABLE class = "Bridge" WIDTH=950> <TR><TD WIDTH="30%">&copy; Theo Todman, June 2007 - August 2018.</TD> <TD WIDTH="40%">Please address any comments on this page to <A HREF="mailto:theo@theotodman.com">theo@theotodman.com</A>.</TD> <TD WIDTH="30%">File output: <time datetime="2018-08-02T06:58" pubdate>02/08/2018 06:58:34</time> <br><A HREF="../../Notes/Notes_10/Notes_1010.htm">Website Maintenance Dashboard</A></TD></TR> <TD WIDTH="30%"><A HREF="#Top">Return to Top of this Page</A></TD> <TD WIDTH="40%"><A HREF="../../Notes/Notes_11/Notes_1140.htm">Return to Theo Todman's Philosophy Page</A></TD> <TD WIDTH="30%"><A HREF="../../index.htm">Return to Theo Todman's Home Page</A></TD> </TR></TABLE></CENTER><HR> </BODY> </HTML>