CREATE TABLE table_73578 ("No. in Series" FLOAT, "No. in Season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

When did the episode titled 'Do you believe in magic' run for the first time?
SELECT "Original air date" FROM table_73578 WHERE "Title" = 'Do You Believe in Magic'
SELECT "Original air date" FROM "table_73578" WHERE "Title" = 'Do You Believe in Magic'