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The Health bulletin [serial] - University of North Carolina at Chapel Hill

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6 <strong>The</strong> <strong>Health</strong> Bulletin July. 192",<br />

iiiteslinal tract is filltMl witli a substance<br />

which iticvents danjierous collapse,<br />

and also sets up the beginning<br />

<strong>of</strong> a "system <strong>of</strong> contractions" known<br />

as peristalsis. For its protection n<strong>at</strong>ure<br />

has provided it with a certain degree <strong>of</strong><br />

ininiunity which protects it from some<br />

(iinimunical)le diseases for a varying<br />

period <strong>of</strong> time. Its heart, with an intric<strong>at</strong>e<br />

system <strong>of</strong> muscles and valves<br />

and so on is a marvel <strong>of</strong> perfect workmanship.<br />

<strong>The</strong> bloo

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