Plague in San Francisco.—Mighty efforts are being put forth in San Francisco at the present time to rid that city of the plague conditions. At the head of this work is Dr. Blue, a federal officer. The great danger now, Dr. Blue tells us, lies in the spring crop of fleas. Fleas infest rats, rats are infected with plague, fleas become infected and inoculate human beings with the plague bacillus. Rats have been found in rabbit warrens, and rabbits are ordered destroyed. Other pets, such as dogs and cats, are likely to spread the plague. Rats swarm in the city and around the wharves. Thousands upon thousands have been killed, thousands more must be killed yet if victory is assured. One journal estimates the cost to San Francisco alone at $500,000. The federal government is bearing its share of the expense also. The failure to stamp out plague conditions now will mean the quarantine of the city a little later, which would practically spell its ruin. Poor San Francisco has been struck hard. Earthquake, fire, graft, drunkenness, crimes of various sorts, and now the plague. We sympathize with many of the merchants and business men who are making a fight for very existence. We sympathize with the men who are endeavoring to clean up the city and earnestly hope they will be successful.