ll are things." "They are
pretty." "All spell alike." "All are furry" (or soft, hard,
etc.).

(d) _Knife-blade_, _penny_, _piece of wire_

_Satisfactory_. "All are made from minerals" (or metals). "All
come from mines." "All are hard material."

_Unsatisfactory._ "All are made of steel" (or copper, iron,
etc.). "All are made of the same metal." "All cut." "All bend
easily." "All are used in building a house." "All are
worthless." "All are useful in fixing things." "All have an
end." "They are small." "All weigh the same." "Can get them all
at a hardware store." "You can buy things with all of them."
"You buy them with money." "One is sharp, one is round, and one
is long" (or some other difference).

Such answers as "All are found in a boy's pocket," or "Boys like
them," are not altogether bad, but hardly deserve to be called
satisfactory. "All are useful" is _minus_ unless the subject can
give a use which they have in common, which in this case he is
not likely to do. Bizarre uses are also _minus_; as, "All are
good for a watch fob," "Can use all for paper weights," etc.

(e) _Rose_, _potato_, _tree_

_Satisfactory._ "All are plants." "All grow from the ground."
"All have leaves" (or roots, etc.). "All have to be planted."
"All are parts of nature." "All have colors."

_Unsatisfactory._ "All are pretty." "All bear fruit." "All have
pretty flowers." "All grow on bushes." "All are valuable" (or
useful). "They grow close to a house." "All are ornamental."
"All are shrubbery."

REMARKS. The words of each series lend themselves readily to
classification into a next higher class. This is the best type of
response, but with most of the series it accounts for less than two
thirds of the successes among subjects of 12-year intelligence. The
proportion is less than one third for subjects of 10-year intelligence
and nearly three fourths at the 14-year level. It would be possible and
very desirable to devise and standardize an additional test of this
kind, but requiring the giving of an essential resemblance or
classificatory similarity.

For discussion of the psychological factors involved in the similarities
test, see VII, 5.

CHAPTER XVIII

INSTRUCTIONS FOR YEAR XIV.

XIV, 1. VOCABULARY (FIFTY DEFINITIONS, 9000 WORDS)

PROCEDURE and SCORING, as in VIII, X, and XII. At year XIV fifty words
must be correct