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abscess accustomed active acute affecting the heart antitoxin arteries avoid beats blood supply blood-vessel bodily body breath cent CHAPTER chest pain child congested damaged heart defect demands dentist diet digestive diphtheria disturbances doctor efficiency emotional strain enlarge excess exer exertion faulty habits feel focal infection forms of exercise frequently germs growing pains heart action heart affections heart disease heart exercise creed heart health heart involvement heart load heart muscle heart patient heart protest heart rest heart trouble heart valves illness increased kidney live lung meal means measles medicine mental modern motor murmur muscular Nature nerve never nourishment organs perhaps person physical effort physician poisons prostrated Pyorrhoea relaxation requires rheumatic fever scarlet fever sign of heart stomach sudden sufficient syphilis teeth thing thought throat tion tissue tonsils tooth typhoid fever usually vessels walk X-ray