THE ARGUMENT FOR SOLIDITY. 



271 



observed fortnightly tide corrected to the moon's mean 

 orbit. 



It is important to notice that any cause, whose period ap- 

 proximates to a fortnight, even if acting for a small part of 

 the year, and that discontinuonsly, must necessarily have its 

 effect included in the measured fortnightly tide. 



I have derived the results tabulated below from the above- 

 mentioned tidal reports, and by calculation ; those ports only 

 being selected at which observations extend over at least 

 six years. In the first column is the name of the place ; in 

 the second, its latitude ; in the third, the least and greatest 

 j^early values since observations have been made ; in the 

 fourth, the mean of the yearly observations ; in the fifth, the 

 theoretical tide calculated on the equilibrium theory ; in the 

 sixth, the same value corrected for motion by Professor Dar- 

 vrin's method : and in the last, the further correction for a 

 globe as elastic as steel. 



Name. 



Karachi . . 

 Bombay . . 

 Do. (Princess 

 Dock) . . 

 Vizagapatani 

 Madras . . 

 Aden . . . 

 Port Blair . 

 Beypore . . 

 Cochin . . 

 Colombo . . 

 Galle . . . 



Miu.-ilax. 



•078 

 •083 



•079 

 •082 

 •056 

 •065 

 •067 

 •118 

 •072 

 •066 

 •073 



o 



•016 

 •023 



•023 

 •024 

 •028 

 •029 

 •029 

 •030 

 •031 

 •032 

 •033 



y u ^^ 



g o « 



^^ 



^ Ed 



•010 

 •015 



•015 

 •016 

 •019 

 •019 

 •019 

 •020 

 •021 

 •022 

 •022 



We have now only to discuss these results. 



If the observed fortnightly tides are made up mainly of a 



