Porter — The Growth oy St. Louis Children. 271 
18, 19. Strength of Squeeze. 
1, Depress the trigger of the clan tiger until the point of the indicator 
is seeing over the zero line of th 
2. e pupil grasps the oval via ia the right hand and squeezes his 
est. 
8. Read the outer scale (graduated from 0 to 160) to pounds* as ex- 
actly = possible. Write the number after ‘*18. Strength of Squeeze, right 
hand 
4. Re set the instrument, and test left hand. [Please do not touch the 
indicator. Always use the trigger. ] 
20, 21. Girth of Chest. 
1. Take four pupils into the cloak room. They remove clothing over 
level with the nipples, and are dictated in centimetres and decimal frac- 
tions of a centimetre to a pupil assistant, who writes them opposite 20 
and 21 
2. ‘* Forced expiration.’’ Pupil breathes out, makes chest as small as 
possible, inclines head forwards, draws shoulders slightly together. 
d inspiration.’? Shoulders back, head raised, deepest possible 
inspiration. 
{Some children will require to be shown how to do this. As fastasa pupil 
is measured, dresses and returns to his seat, another pupil enters the cloak 
room to take his place, and strips for measurement. ] 
22, Weight. 
The upper figures on the beam and the smaller of the two numbers on the 
iron weights are used with the scale pan. Pay no attention to them. The 
lower figures on the beam read from 1 to 45 pounds. Place the pupil’s 
approximate weight on the counterpoise at the end of the beam; move the 
poise along the latter until the scale balances. Add the larger number on 
the hanging weight to the number marked on the lower scale by the poise. 
The sum is the pupil’s weight. 
23, 24. Acuteness of Vision. 
It is necessary to make these tests between 10:30 a. r better 11 
a.m., and 8 p. m., as at other hours the winter light is ainticiaet: 
A pupil must not see the card before the moment for his test has come. 
Nor can the pupils who have been tested be allowed to communicate with 
those yet to be tested. Otherwise the letters will be committed to memory 
and the test spoiled. 
1, Hang the test card on the wall opposite the windows, in a good light, 
and level with the pupil’s eyes. Turn down the middle leaf of the card, so 
that only one set of test letters is visible. 
2. Stand the pupil with toes touching a chalk mark 16 feet 5 inches from 
the card, and cover the left eye with the blinder furnished for that pu 
The head must be held straight, so that the child cannot see the test letters 
with the blinded eye. 
* wo dynamometers were graduated metrically. 
