FOGn. A substance remaining after the last analysis of San Franciscan atmosphere — the sewer-gas, dust, cemetery effluvium, disease germs and other ingredients having been eliminated. Of these, however, dust is the chief; and as Mr. Edmund Yates, by combining the words “smoke” and “fog,” gave to the London atmosphere the graphic name of “smog,” we, in humble imitation but with inferior felicity, may confer upon our own grumous environment the title of “dog.”