CONTENTS 



Proceedings of the Elisha Mitchell Scientific Society, 



December, 1916, to March, 1920 i 



Proceedings of the North Carolina' Academy of Science. . 7 



The Theory of Relativity. Andrew H. Patterson 19 



A New Method for Laying Out Circular Curves by De- 

 flections FROM the p. I. T. F. Hickerson 42 



A Remarkable Form of Skeletal Element in the Lithistid 

 Sponges (A Case of Analogical Resemblance). H. V. 

 Wilson . . • 54 



The Turtles of North Carolina. C. S. Brimley 62 



A Little-Known Vetch Disease. Frederick A. Wolf 72 



Notes on the Mosquito Fauna of North Carolina. Frank- 

 lin Sherman 86 



An Interesting Fertilizer Problem. H. B. Arhuckle 94 



Azalea atlantica Ashe and Its Variety luteo-alba n. var. 



W. C. Coker 97 



A New Species of Achlya. W. C. Coker and /. N. Couch 100 



Proceedings of the Elisha Mitchell Scientific Society, 



May, 1920, TO December, 1920 103 



James Jacob Wolfe, 1875-1920 no 



The Chemical Behavior of Zirconium. F. P. Venable 115 



A Pure Culture Method FOR Diatoms. Bert Cunningham .. . 123 



The Occurence of Unlike Ends of the Cells of a Single 



Filament of Spirogyra. Bert Cunningham 127 



Some Marine Molluscan Shells of Beaufort and Vicinity. 



Arthur P. Jacot 129 



Notes on the Thelephoraceae of North Carolina. W. C. 



Coker 146 



