658 



POPULAR SCIENCE MONTHLY. 



mary cause of factors considered in this study, they themselves 

 ■would fail to show upon the tables. 



Humidity. — This figure (Fig. 5) indicates in a very decisive man- 

 ner that states of lovsr relative humidity, as shown by both maxi- 

 mum and minimum readings, are conducive to excesses in both the 



21.20 24.30 2i.40 



Barometer, Inches 

 24.50 21.60 21.70 21.80 24.90 



25.00 a"..lO 25.20 



ft, 20 



J/ao". Carom.-) ^i^^^era 



.1/1)1. Barom. ] 



,Vni»in/ Maximum 



. Max. BaromA_ suicides 

 Min. Barom, 3 

 = Normal Minimum 



Fig. 4. 



classes of crimes studied. For instance, for maximum humidities 

 between ten and twenty the proportion of actual crime to that ex- 

 pected is 1 : 0.1; between twenty and thirty (suicide), 11 : 1; be- 

 tween 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 ex- 

 perienced the general low humidities of our Colorado altitudes 



Uumidity, Uundredtlis 

 10 20 30 40 50 60 70 80 90 100 



^ 20 



Max. numid. )ju^rdera 



Min. Humid. ) 



Normal Maximum 



■^l"^- ">"">''■ \ Suicides 



Min. Ilutnid. ) 

 -.Normal Minimum 



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 



