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Show Dr. Kulhs a British physician, has been Investigating tho effect of strenuous stren-uous cxerclso on tho condition of tho organs during growth nnd adolescence Dogs wero made to cxerclso on n treadmill during various periods, whllo other animals of tho snmo Utters wcro kept as "controls." Tho result was considerable growth, especially of tho heart and liver. Simitar changes wero found In young swlno treated In tho samo way. Tho Incrcaso In tho bulk of the muscles wnB not so great as that in tho heart In dogs, Even tho marrow of tho bones was affected. Tho working animals showed good, red marrow and tho resting ones yellow, fatty marrow. Tho doctor assorts that the results of his experiments confirm what physiologists havo taught, that exercise, especially In tho young, exerts n beneficial Influenconot only on tho skclctn muscles'but also on tho Internal organs. All nnlmals living In n free condition Indulge In violent movements and hunting gomes when young. Thus also wo find mas-slvo mas-slvo hearts In persons who havo followed fol-lowed a strenuous calling, as compared com-pared with tho hearts of thoso who havo had a sedentary occupation. |