TABLE FOR OTIS I. Q. 739

couraged by unjust taxation and inadequate fire protection.X. What Is Needed.A. Increase in Public Forests.B. Practice of forestry in privately owned forests.XI. Important Phases of Forestry.A. Protection from fire, fungus diseases, and insect pests.B. Proper cutting of our remaining forests.C. Putting to work of idle, forestable lands.

A SIMPLIFIED TABLE FOR OTIS I. Q.BY H. V. MAIN,

Harrison Technical High School, Chicago.To make the finding of the I. Q. from the results derived when using the

Otis Self Administering Tests easier and safer, I have devised the follow-ing table based upon the table of norms given in the manual.Years.---.------.----.-12 13 14 15 16 17 18Birth MonthAug.-����������77 72 68 64 61 59 58July..� ���.������� 76 72 68 64 61 59June���� - .�������76 71 67 63 61 59

May..�� ��������75 71 67 63 60 59Apr.��� ���������75 71 67 63 60 59Mar.������������75 70 66 63 60 59

Feb.������������74 70 66 62 60 58Jan.����� ������74 70 66 62 60 58Dec.������������73 69 65 62 60 58

Nov.����������--73 69 65 62 59 58Oct.--�����������73 69 65 61 59 58Sept.---�����--�-72 68 64 61 59 58To find the I. Q. by this table find the number under the age in years at

the last birthday and opposite the birth month. Add the number to thescore, or number of right answers, the total is the I. Q. For example thepupil is 15 in May, for the score use 45, the number questions he answeredcorrectly. Under 15 and opposite May is the number 63 which addedto 45 gives 108 the I. Q.

This particular table is arranged for use early in September, hence birth-days in August are considered as in even years, no months. Birthdaysin July make the pupil one month older so the second line for two monthsin the table in the manual, is marked July and so on down the othermonths. If the test is used in some other month than September thenames of the months will have to be arranged accordingly. If form B isused four points are to be added to the numbers given here.The derivation of this table is as follows. The age norm is subtracted

from 100 to obtain the numbers for the corresponding ages. The monthof the test is used for the last line if the test is given early in the month.Each later month is written in turn on the preceding line so that the pastmonth is on the first line as indicated in the table.The use of this table eliminates the calculation of the age in months

from the information given by the pupil. It eliminates a subtraction,and gives at one reading the desired number to add to the score, for anyage. It is much easier to read than the chart given in with the tests.