170 A. M. Mayer— Researches in Acoustics. 
Uncorrected. Corrected. Wt. 
—— 35°4 e8 24 
—3°7 —0°8 16 
—6 °4 —6°3 4 
+4°3 +3°5 13 
+2°0 —0 2 44 
+70 +2°5 21 
——1°8 —6 °2 Zi 
+3°9 —3°8 oo 
—3°3 —3 ‘2 21 
—1-°2 +0 °6 76 
by the application of the hypothetical corrections. Although. 
the observations are too uncertain, and the residuals too irreg- 
ular, to regard this result as proving the hypothesis, yet it 
eems to me to render it worthy of reception as being, in the 
present state of our knowledge, the most probable explanation 
of the outstanding differences of long period between the theo- 
retical and observed longitude of the moon. 
Art. XVL—Researches in Acoustics; by ALFRED M. MAYER. 
Paper 5 ; 
(Continued from page 109.) 
5. Six Experimental Methods of Sonorous Analysis described and 
discussed. 
Tr remarkable discoveries in sound made in these later 
times by Helmholtz were owing, in great part, to his having 
fertile theorem of Fourier. As Helmholtz distinctly_ states: 
“In letzter Instanz ist also der Grund der von P. oras 
aufgefundenen rationellen Verhiiltnisse in dem Satze von Fou- 
rier zu finden, und in gewissem Sinne ist diese Satz als die 
Urquelle des Generalbasses zu betrachten.” (Tonempfindungen, 
p- 346.) : : : 
The evident importance of the subject of sonorous analysis 
will probably render interesting the few remarks I here ven- 
ture to offer on this subject. I will describe in order six meth- 
