(7) An artificial classification is made on the basis of some arbitrary connection; a natural classification, on some inherent mark of resemblance. (8) The rules of logical division are applicable in any classification. In addition to these a classification should (1) be appropriate and (2) afford opportunity for the greatest possible number of assertions. (9) Classification should be the mode of procedure in the lower grades, division in the higher grades. =12. REVIEW QUESTIONS.= (1) Define and illustrate logical division. (2) What is the meaning of proximate genus? (3) How does logical division differ from enumeration? Illustrate. (4) Distinguish between logical division, and physical division or partition. (5) Illustrate a quantitative partition; a qualitative partition. (6) Illustrate how a logical division may be summarized in the form of a series of judgments. (7) State and explain the rules of logical division. (8) State the rules violated in the following divisions, explaining in full: { Primary { Secondary (1) Education { Collegiate { Technical { Scientific { Professional { Infancy (2) Life { Childhood { Youth { Old age { Caucasian { Ethiopian (3) Man { Malay { Mongolian { American { Cement { Frame (4) Buildings { Stone { Dwellings { Barns { Churches (9) Show the difference between contradictory and opposite terms. (10) Define dichotomy. (11) Illustrate the Tree of Porphyry and indicate its use to scientists. (12) Illustrate the difference between classification and division. (13) Why should classification be the mode of procedure when dealing with immature minds? (14) Illustrate the difference between an artificial and a natural classification. (15) State and explain the two rules of classification. (16) Show which of the following divisions are logical and which are not: (1) The manifestations of the mind into knowing, thinking and feeling. (2) Books into mathematical and non-mathematical. (3) Students into those who are industrious, athletic and shiftless. (4) Flowers into roses, carnations and lilies. (5) Planets into those which are larger than the earth and those which are smaller. =13. QUESTIONS FOR ORIGINAL THOUGHT AND INVESTIGATION.= (1) Analyze by mathematical partition the terms world, plant, book. (2) Analyze by logical partition the terms granite, water, air.