CREATE TABLE table_3432 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Director" CLOB, "Writer ( s ) " CLOB, "Airdate" CLOB)

What episode number of the series aired on February 26, 1968?
SELECT "Series #" FROM table_3432 WHERE "Airdate" = 'February 26, 1968'
SELECT "Series #" FROM "table_3432" WHERE "Airdate" = 'February 26, 1968'