PAPERS OX CHEMISTRY AND PHYSICS 311 



against. TTliile many things may be learned from 

 further experience and mnch may be gained from addi- 

 tional theory, enough has been revealed to give en- 

 couragement to the belief that soundproofing may be 

 prescribed in the future with some of the certainty that 

 now attends the acoustic design of auditoriums. 



