The Ohio T\^aturalist, 



PUBLISHED BY 



The Biological Club of ihe Ohio State Uni'versity, 

 Volume III, APRIL, 1903. No. 6. 



TABLE OF CONTENTS 



Jennings— Further Notes ou ^^ome Climatic Conditions of Ohio 40o 



Smith— The Song of the Fox Sparrow 4!1 



Sanders— Chionaspis. (New Species.) 413 



Selby— An American }*Iemoir ou Etiolation Studies 415 



HiNE— The Genus Peditia With One New Species 417 



Claassen— Interesting Specimens of Specularia Perfoliata 41S 



FURTHER NOTES ON SOME CLIMATIC 

 CONDITIONS OF OHIO. 



Otto E. Jennings. 



An attempt was made in a former article* to present in brief 

 form some of the conclusions reached in a stud}' of the climatic 

 conditions of Ohio from an ecological point of view. Further 

 work along this line has shown that a more extended compilation 

 of data is ver}' desirable, if not actually necessary, in anything 

 approaching a comprehensive study of Ohio climate as an eco- 

 logical factor. 



So, in order to get a better basis for study, data were compiled 

 relative to (a) wind velocity and direction, (d) relative humidity, 

 and (c) average date of first and last killing frost of the season. 



WIND, — DIRECTION AND VELOCITY. 

 Plate 12. Map IX. 



In attempting to derive as accurate general averages as possible, 

 use was made of records as taken by self -registering instruments 

 of the U. S. Weather Bureau stations at Cincinnati, Columbus, 

 Cleveland, Toledo, Sandusky and Pittsburg. These records extend 

 back to 1892, thus giving readings of ten consecutive years. 



As generally supposed the prevailing direction of the wind in 

 Ohio is south-west. The direction in the region of Cincinnati 

 seems to be very uncertain ; it is given on our map as south-west 

 based on averages reported by the U. S. Weather Bureau in 1896 

 for a period previous to that date, but for the period 1892 to 1902 



Ohio Naturalist, 3 : 339-345. Jan., 1903. 



