The Ohio ^J^Catiiralist, 



PUBLISHED BY 



The Biological Club of the Ohio State Uni'versity, 

 Volume III, JANUARY, 1903. No. 3. 



TABLE OF CONTENTS 



Jennings — Some Climatic Conditions of Oliio MH9 



UiDDi.E— Fasciation oJti 



Cook— Tlie Development of the Embryo-sac and ICmbryo of Claytonia virgiiiica 349 



SWEZEY— Life-History Notes on Two Fnlyoridif 354 



Wells— Adaptability in Ferns 35S 



Morse— Ohio Reptiles and Batraeliians SIO" 



Claassen — On Disceliumnndum Bridel 361 



Claassen — An Entimeration of the Plants (irowini;- on a Big Erraiic Bimlder. . . 362 

 GiuGijs— fleeting of the Biological Chita 362 



-SOME CLIMATIC CONDITIONS OF OHIO. 



OTTO K. Jennings. 



Plant Ecolog}' has to do with the adaptations and modifications 

 of plants to each other and to the outside world. In taking up 

 the study of plant ecology it is necessary, therefore, that factors 

 external to the plant be taken into consideration. We must study 

 the environment of the plant as well as the plant itself. 



Probabh- a majorit}- of the factors which make up the environ- 

 ment of plants and thus have to do with plant ecology fall within 

 the domain of meteorology. Light, temperature, wind, and 

 moisture ( in its different forms) are all very important ecological 

 factors and to their variations both singly and in combination are 

 due most of the characteristic differences in the flora of different 

 regions. 



Practical workers along the different lines of plant production 

 must keep within more or less definite limits determined by me- 

 teorological conditions. No farmer, orchardist, or gardener can 

 well afford to ignore such things and much less can the ecologist, 

 working more or less upon a theoretical basis, expect to accom- 

 plish much without taking into account these various metecro- 

 logical factors. 



In connection with Prof. Schaffner's work on the plant ecology 

 of Ohio the writer has endeavored to work out the general 



Read before the Ohio .\cademy of Science, Nov. 1902, Columbus, Ol.io. 



