50 RECORD AND PvEDUCTION CF THE TIDES. 



The second form, or Table No. 2, for reduction of tides, is specially arranged to 

 obtain the establishment and the half-monthly inequality in time and height. The 

 first part is arranged in reference to the observed high waters; the second part, in 

 reference to the low waters. Tliat the inequality in time and height should also 

 be made out from the low water, is specially important for stations where either 

 the observations are of short extent, or else where difficulties tend to render the 

 observations less accurate. The discussion of the low waters could not be omitted 

 in our case. The headings to the columns of Table No. 2, explain the arrangement 

 sufficiently. The results from the upper and lower transit of the moon are kept 

 separate. (It need hardly be remarked that, in certain months, the sun's or moon's 

 lower transit can be observed at Van Rensselaer Harbor.) 



