mary cause of factors considered in this study, they themselves could fail to show upon the tables.
Humidity.—This figure (Fig. 5) indicates in a very decisive manner that states of lower relative humidity, as shown by both maximum and minimum readings, are conducive to excesses in both the
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/91/PSM_V55_D678_Relationship_of_barometric_pressure_and_crime_rates.png/460px-PSM_V55_D678_Relationship_of_barometric_pressure_and_crime_rates.png)
Fig. 4.
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
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/98/PSM_V55_D678_Relationship_of_humidity_and_crime_rates.png/460px-PSM_V55_D678_Relationship_of_humidity_and_crime_rates.png)
Fig. 5.
(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