HUMIDITY.--This figure (Fig. 5) indicates in a very decisive manner that states of low relative humidity, as shown by both maximum and minimum readings, are conducive to excesses in both the classes of crimes studied. For instance, for maximum humidities between ten and twenty the proportion of actual crime to that expected is 1:0.1; between twenty and thirty (suicide), 11:1; between thirty and forty, 9.5:4.5; between forty and fifty, 15:8. The maximum curves show somewhat the same general relation though not with quite so marked divergences. To one who has experienced the general low humidities of our Colorado altitudes (Denver is one mile above the sea level) this result is not surprising. There is no doubt that a nervous tension much in excess of that common in the lower altitudes exists, due in part, perhaps, to the deficiency in barometric pressure and a consequent effect upon the respiratory processes, but probably, as shown by these curves, more largely to the dryness of the atmosphere, as indicated by low humidity. I hope at some future time to verify or disprove this supposition by a comparative study made at some lower altitude. [Illustration: FIG. 6.] CHARACTER OF THE DAY.[D]--Fig. 6 shows the relation between the expectancy of crime, based upon the actual per cents of cloudy, partly cloudy, and clear days (records of nineteen years), and its actual occurrence. The disagreements are very slight, although a slight excess of murders is shown for cloudy days. [Footnote D: By the United States Weather Bureau days are characterized as "cloudy" when for 0.8 or more of the possible hours of sunshine the sun is obscured; "partly cloudy" when from 0.4 to 0.7 inclusive is obscured; and "clear" when 0.3 or less.] SUMMARY.--Fig. 1 shows at a glance no generally prevailing meteorological conditions to which can be ascribed, with any degree of certainty, the monthly variations of crime. Fig. 2 shows that high velocities of wind seem to increase to a marked extent the tendency to crime. For the highest velocities increasing the probability twenty times (two thousand per cent). Fig. 3 shows that high temperatures seem to have the same effect, that of between 90° and 100° increasing the probability one hundred per cent. Fig. 4 fails to show that barometric changes are accompanied by any marked excesses in crime. Fig. 5 shows that low conditions of relative humidity are attended with very marked excesses, those below thirty increasing the probability of suicides eleven times (eleven hundred per cent). Fig. 6 fails to show that the character of the day has any considerable effect.