99-DEGREE HEAT IN CITY; 12 DEAD HERE, 50 IN NATION; COOLING RAIN IS DUE TODAY; 38 PROSTRATION CASES Temperature of 137 Is Recorded in Sun in Central Park. PARKS OPENED FOR SLEEP Walker Makes an Emergency Ruling–Orders Sprinklers for Tenement Children. 18 HORSES DROP IN STREET Heat Here Within 3 Degrees of All-Time Record–Wave Ends in Some Sections. Heat of 103 in Washington. 99-DEGREE HEAT KILLS 12 IN CITY Warns on Wasting Water. Summer School Moves Outdoors. Mercury at 100 in Queens. Eighteen Horses Prostrated

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