In both 1 and 2 the word man is used to denote objects, hence it is employed in extension.
3b. Use the term vegetable in extension by answering the two questions in 3a.
4a. Decrease one by one the qualities of some common object with a view of noting how when the intension is decreased the extension is increased.
| Intension | Extension | |||
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4b. With a view of noting how when the intension is decreased the extension is increased, decrease one by one the common qualities of peach tree.
5a. In the following series what word could be substituted for “mammal” and why? Being, organized being, animal, vertebrate, mammal. Answer: Fish, reptile, or bird; because there are atleast seven classes of animals which belong to the vertebrate family, any one of which could be used to complete the series.
5b. Form a series of which “Baldwin apple” has the narrowest extension. What terms may be substituted for “Baldwin apple?”
6a. In a series of which “pupil” is a member show that the increase and decrease is not proportional. The series: logic pupil, pupil, youth, human being, being. In decreasing the intension of “logic pupil” by dropping the one quality, logic, the extension is made larger by many more than one, as “pupil” represents many more objects than “logic pupil.” Therefore, the increase is not in proportion to the decrease.
6b. In a series in which “ruler” appears, show that the increase and decrease is not proportional.
7. From the following list select the proper words of the series; arrange them; draw and name the triangles: Caesar, brute, man, Roman, American, biped, sensuous being, animal, individual.