How many episodes had the series number of 38?
CREATE TABLE "table1_19925114_1" (
  "no_in_series" real,
  "no_in_season" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" text,
  "u_s_viewers_millions" text
);
SELECT COUNT("directed_by") FROM "table1_19925114_1" WHERE "no_in_series"=38;