. L'Ontario public School hygieny . e polmoni, e impedire che l'aria passi liberamente nel sangue. Il risultato è che le persone che hanno respirato tale aria, soffrono in salute e non vivono solong come coloro che trascorrono la vita in un'occupazione outdoor. Potete capire come la polvere può soffocare su i ourlungs, se guardate le foglie più vecchie e più basse di abuttercup o del dente di leone.These foglie si sono transformate con la polvere e nel tempo muoiono, in parte effetto fromthe della polvere,in parte dal shading.The la polvere copre sopra thetiny piccole aperture sulle foglie, Così che theycannot respirare propriamente.per rimediare a questo, thep

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. The Ontario public school hygiene . e lungs, and prevent the air from passing freely intothe blood. The result is, that people who have tobreathe such air, suffer in health and do not live solong as those who spend their lives in an outdooroccupation. You may understand how dust can choke up ourlungs, if you look at the older and lower leaves of abuttercup or dandelion.These leaves becomecovered with dust andin time die, partly fromthe effect of the dust, partly from the shading.The dust covers over thetiny little openings onthe leaves, so that theycannot breathe properly.To remedy this, theplant keeps growingnew leaves above theold ones, and these newleaves can always takein enough air to keepthe plant alive. Unfortunately for us, we are not ableto grow new lungs whenever we may happen to needthem. It is generally believed that the high death-rate whichprevails in small houses is due to lack of fresh air, butno doubt other causes such as dirt, lack of clothing, andlack of proper food help to produce the high death-rate.. iGURE 1.—One of the mouths on the undersurface of a leaf. A, opening into the leaf.B and C, cells that guard the opening at A. 16 PUBLIC SCHOOL HYGIENE The following diagram represents the results of actualobservation and shows by the relative sizes of the figuresand their sub-divisions the death-rates that result frominfectious diseases, nervous and nutritive diseases ofchildren, and lung and other diseases in the case ofthose who live in small houses and of those who livein larger ones. Infectiousdiseases. Nervous and Nutritive B diseases. Lungdisease. Otherdiseases. Infectious. Nervous andNutritivediseases. Lungdisease. Other diseases. C Infectious. Nervous and Nu Lungdisease. Otherdiseases. A—One and two room houses, death-rate high. B—Two and three room houses, death-rate less. C—Three and four room houses, death-rate still less. The truth is that bad air in rooms, whether they arelarge or small, is always harmful to those who live in

Parole chiave associate all'immagine

• bookcentury1900
• bookdec
• booksubjectchildren
• booksubjecthygiene