Every reader of the French or German papers knows that not a day passes without producing some uneasy discussion of supposed social decrepitude;Mfalling off of the birthrate;Mdecline of rural population;Mlowering of army standards;Mmultiplication of suicides;Mincrease of insanity or idiocy,—of cancer,—of tuberculosis;Msigns of nervous exhaustion,—of enfeebled vitality,—"habits" of alcoholism and drugs,—failure of eyesight in the young,—and so on, without end.