Felt it was time for another Density™ puzzle. Warning: May require thinking. Enjoy!
Final answer: (3,4,4,4)
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interpret the given dots as Braille numbers. (There's no number sign at the beginning, as there normally would be.)
9 92 7 74 53 90 6 2 109 47 16
take the chemical symbols of those elements of the periodic table.
F U N W I Th C He Mt Ag S, or FUN WITH CHEM TAGS.
"Elementary" of course refers to the chemical elements; "Louis" is Louis Braille, inventor and namesake of his writing system for the blind.