Pharynx, [175]
Play a form of work, [52]
Playgrounds, [161]
Pocket cuspidors, [152]
Ptomaines, [19]
Quarantine, breaking, shows selfishness, [126];
how broken by family, [105];
rules of, [105];
seriousness of breaking, [101];
when safe to raise, [102];
why necessary, [101];
why some cases escape, [102–104]
Reflex action, [181]
Respiratory system, [174–177]
Rest, proper amount of, [51]
Retina, [178]