so KANSAS ACADEMY OF SCIENCE. 



this State. Our observations on this point are limited to the brief 

 period of two complete years, during which time the average relative 

 humidity was 66.4, complete saturation being represented by lOO. 

 By this is meant that upon the average the air contained two-thirds of 

 the amount of moisture it was capable of containing. This percent- 

 age of moisture forms a very desirable mean between the very moist 

 and the very dry, being alike favorable to the healthful condition of 

 man, the domestic animals and the growing crops. The relative 

 humidity at Philadelphia is ^2, the air containing nearly three-fourths 

 the amount of moisture required for saturation. 



I have thus briefly touched upon the most important features of 

 the climate of Kansas, as illustrated by my own observations, trusting 

 that these results may lead to a more accurate knowledge of the 

 subjects involved than is generally possessed by the citizens of Kan- 

 sas and other States. 



Respectfully yours, 



FRANK H. SNOW, 



Professor of Natural History and Meteorology in the University of Kansas. 



GEOLOGY OF THE ARKANSAS. 



BY B. F, MUDGE. 



This paper is based on observations made in the Arkansas valley 

 at various visits during the past five years, and particularly on a 

 trip recently made as far west as Fort Aubrey, near the Kansas 

 and Colorado line. We confine our remarks to that part between 

 Hutchinson and Fort Aubrey, or that portion covered by the red 

 sandstone of the Cretaceous period. 



Observations made the past year confirm the statement in one of 

 my papers read before a former meeting of this Association, viz.: 

 that there is in Kansas no geological representation of the formations 

 found in other countries, between the upper Carboniferous measures 

 or Permian, and the Cretaceous. Careful search has been made for 

 fossils of Jurassic and Triassic periods along the western borders of 

 the Permian, and none have been found, while dicotyledonous leaves 

 and other Cretaceous fossils have lately been procured nearer the 

 line of the Permian than during our first collections. 



The Arkansas valley, by its fossils, shows the same peculiarity. 



