79 



original order and relations are changed and are replaced by others 

 which were wholly unforeseen, so that the observations must necessarily 

 be free from the possibility of having been influenced by any mental 

 bias. When we find the effects of a natural law, represented by such 

 minute values as that of the lunar-diurnal variation, exhibited by the 

 observations of a single year with the degree of symmetry shown in 

 Table II, we may safely conclude that the observations themselves 

 are worthy of the labour bestowed in eliciting their results. In this 

 view the Hobarton observations prove themselves to have been not 

 only a faithful, but also an extremely careful series, highly creditable 

 to Captain Kay, R.N., and to the Naval Officers who with him and 

 their Civil Assistant Mr. Jeffery, maintained for so many years the 

 laborious and monotonous duty of hourly observation. 



Table III. exhibits the separate results in each of the three years 

 at Kew, as well as their mean. 



TABLE III. Lunar-diurnal Variation at Kew in the years 1858, 

 1859, and 1860 ; omitting disturbed observations differing 3''3 

 from their final normals. 



