CREATE TABLE table_42564 ("1861" FLOAT, "1866" FLOAT, "1872" FLOAT, "1876" FLOAT, "1881" FLOAT, "1886" FLOAT, "1891" FLOAT)

What is the sum of 1891(s), when 1872 is less than 685, and when 1881 is less than 348?
SELECT SUM("1891") FROM table_42564 WHERE "1872" < '685' AND "1881" < '348'
SELECT SUM("1891") FROM "table_42564" WHERE "1872" < '685' AND "1881" < '348'