18S0. i 



25 



[Chase. 



seen by the following table. Column T contains theoretical harmonic 



wave-lengths ; V contains Vogel's measurements : 



T V 



3968 

 3887 

 3834 

 3795 

 3770 



etc.) give the following 



If we take n = -^j, Paalzow's oxygen lines * (P) are also nearly har- 

 monic (Tj). 



Ti T2 P 



=^ 602. 602. 603. 



= 555.7 558.2 558.2 



= 516. 519.2 519. 



= 481.6 481.1 481. 



= 451.5 452.3 453. 

 The numbers in column T^ are also harmonic, if we take n = j}^. 



Stated Meeting, 3Iay 7, 1880. 



Present, 15 members. 



President, Mr. Fraley, in the Chair. 



Letters accepting membership were received from Mr. 

 Ellis Yarnall, dated 105 S. Front Street, Philadelphia, April 

 21, 1880; Dr. Austin Flint, Jr., New York City, 14 West 

 83d Street, April 21; Mr. Joseph C. Fraley, 1833 Pine 

 Street, Philadelphia, April 22 ; Mr. Horace Howard Fur- 

 ness, 222 West Washington Square, Philadelphia, April 

 24 ; Rev. George Dana Boardman, 3815 Walnut Street, West 

 Philadelphia, April 26 ; Mr. J. Yaughan Merrick, Phila- 

 delphia, April 27 ; Mr. Wm. B. Rogers, Jr., 1000 Walnut 

 Street, Philadelphia, April 27, and Mr. C. P. Patterson, 



* Monatsber. der K. Akad. zu Berlin, Sept., Oct., 1878. 



PROC. AMER. PniLOS. SOC. XTX. 107. D. PRINTED JUNE 2, 1880. 



