Proceedings of the American Academy of Arts and Sciences 

 Vol. XLIII. No. 11. — November, 1907. 



DIFFERENCE IN WA VE-LENGTHS OF TITANIUM 

 W 3900 AND 3913 IN ARC AND SPARK. 



RARY 



By Norton A. Kent and Alfred H. Avfry. 



BOTANICAL 



Investigations on Liqht and Heat made and published, wholly oh in pabt, with Atpiiopeiation 



i'uoa tub Kuau'O&D Fund. 



