KENT AND AVERY. — WAVE-LENGTHS OF TITANIUM. 361 



It is the purpose of the author of the former paper to study with an 

 echelon the position of the narrow and less diffuse lines of the titanium 

 spectrum. 



In conclusion we wish to acknowledge the kindness shown us by 

 Professor Trowbridge and those associated with him in so generously 

 putting at our disposal all the facilities of the Jefferson Physical Labo- 

 ratory ; and our thanks are due also to the Rumford Committee for 

 the grant made in aid of this research. 



Department of Physics, Boston University. 

 June, 1907. 



