456 RESEARCHES IN SOUND. 



Haven, Conn., to 1872, at Portland, Me. The second part is a commu- 

 iiication made to the "Philosophical Society of Washington" (of which 

 he was the president) December 11, 1872, embracing a discnssion of 

 some abnormal phenomena of sound, and is extracted from the Bulletin 

 of the Society, vol. ii, appendix ix. The third part, forming the latter 

 portion of the Api^endix to the Light-House Keport for 1874, comprises 

 investigations extending from 1873, at Whitehead Station, off the coast 

 of Maine, to 1874, at Sandy Hook, New Jersey. The fourth part, extracted 

 from the Appendix to the Light-House Eeport for 1875, comprises his 

 investigations for that year. And the fifth part, from the Appendix to 

 the Light-House Eeport of 1877, embraces his latest observations dur- 

 ing September and October of the year 1877. 



These papers necessarily are more fragmentary, and at the same time 

 involve more recapitulation than would have been the case, could they 

 have received the revision of their distinguished and lamented author. 

 It has however been considered more just to reproduce these contribu- 

 tions in this form, than to attempt either a compilation of extracts, or a 

 condensation of their substance in the form of an abstract.] 



S. F. Baird. 



