Lapp--

ia See

the rermanent teeth are in; resistance to disease is hich. The weicht is
light compared with the heicht of the crowing sirl. There is 2 revid growth
of bones ana muscle. There is a chenze in the blood commosition. By this
time the brain has ceased to rrom in size and weirht. The sirl hrs 2 crea-
tive imeination and the higher mental vovers are <eveloving. There is a
stronz sense of rhythm. The emotions are exceptionally stron= and self-
contrl weka. The nre-rubescent increase in growth in boys usually occurs
one year leter than in zirls. The lune capacity increases alone with the
strenecth of the srin. The brein ceases to increase in size, resistance is
very hizh, «né the eliminetion is also noor.

Dr. Allen, let me interrunt at this point. You have been talking about
brain size, and resistance to disease of chil¢ren who "re of the see, to enter
junior high school. There are some facts about the individual oat this period
that should bo considered. Floyd Rowe, supervisor of health am physical
education of the Clevelsend public schools, his exerimented with the erowth
ane develonprent of boys @urim this veriod. He finds that from February to
June junior high school boys who are regularly onrolled in physical educi=
tion grow from 30 to 90 rer cent rore in weight, lung capacity ° ad grip
strength then did boys not in the progrsm. But from September to Novenber
junior hich school boys on interscholestic basketbell squad aevelored from

40 to 60 ner cent less than @id those in the ordinory ~hysicel eduestion pro-
eran; and over a two-yerr veriod develoned much less then those not enzaging
in varsity snorts. That basketbsll notation looks bac for your snort, Dre
allen.

Allen--Yces, it certainly does, ant it shoule. Meany suthorities state emnhatically

that basketball should not be infulced in ss 2 team croject in lesazue com-
vetition at this aze. The child's nerwus systom tekes 2 terrific punishment
from the ansle of the emotional md vhysicel being. In the interrretation of
this, one shoul? not concluce that strenuous activity is bermful to all boys
in this forrmtive staze of srowth, but it should be interpreted that it is
not advisable to overdo this tyne of intense sctivity until we have founc
evidence to the contrary. Dr. 0. H. McCloy, of the University of Iowa, has
recently suczeste? thit there is som questicn about the sdvisobility of
strenuous commetition durin> this .°e weriod. Recently Dr. Lowman Clendenninr,
in one of his @aily articles in the Fanses City Star, »ointed out that it was
inadvisable for boys unier 144 to engsre in interscholastie football competi-
tion. Only yesterdzy here in Lawrence sn enthusiastic father deplored the
fact that his young son coule not sIsy in junior hizh school lenarue ctames
because the ~hysician hed detected a heart murmur in his son. Rest fora
year for this younc boy will nllow nature to compensate anc the heart resume
normalcy. You will remember that heart murmurs are quite common at this ase.

Now to summarize: This younsster up to 10 years of age is just a young em
ing humn animel. His job is to develop 2 stronz muscular end orgenic foun-
dation in which the nervous systen is to mature. It is through his tlay ene
the activities that he inlulzes in that he accomplishes this sim. His ner-
vous system is the last of the highly specialized tissues to be Geveloped.
Healthy nervous reactions depene unon bodily visor. The fundamental croup
muscles, such as are cmployed in runnin:, leaving, jumpins, vaulting, climb-
ing ad swincine arc the muscles that rroduce robust vitslity. The accessory
aroun muscles, which are ordinarily employed in the fin r movements, neces-
sitate 2 complex coordinntion of nervous control, 2 eontrol which is entirely
lecking in the early years of physicsl srowth. The dhili at this time is not
himself. He is someone else in his own imagination. His activitics must
appeal to his drictic sense. Whether he be 2 make-belicve All-American
football player, an aviotor, or an engineer, he is what he would have his