OF THE TIDES IN THE PORT OF LONDON. 



31 



Hence, applying these corrections with opposite signs to Table XVIII., we obtain the 

 residual phenomenon as follows, in hundredths of feet. 



Table XVIII. freed from the Sum 17 (jo - P). 



There is no very manifest rule in this Table. There appear to be many large posi- 

 tive terms between the hours 2^30"^ and 7'S and for parallaxes greater than 57', while 

 the terms for other hours are more generally negative. 



But it appears to be better to wait for the examination of other observations than 

 to attempt to found a formula on these circumstances. 



4. Correction of the Heights for Lunar Declination. — Table XX. of Mr. Lubbock 

 will supply the means of determining the law of the effect of the lunar declination 

 upon the height, being a Table of the heights arranged according to intervals of 3° 

 of declination, and according to the time of the moon's transit. We shall place here 

 the Table, expressed in hundredths of feet. 



