32 



MR. AIRY ON THE LAWS OF THE TIDES 



1st Group, June 

 2nd Group, June 

 3rd Group, July 

 4th Group, July 

 5th Group, July 

 6th Group, July 



d h 



22 11 to June 



In like manner, a series of groups was formed, determined by the increase or de- 

 crease of the moon's declination without regard to its sign ; one day being added to 

 each of the times when the moon's declination was 0, and when it was maximum 

 either north or south. Thus the following separation of groups was made. 



d h 



29 21, declination decreasing. 



29 21 to July 7 0, declination increasing. 



7 to July 



13 3 to July 



19 19 to July 



27 4 to August 3 9, declination increasing. 



7th Group, August 3 9 to August 9 12, declination decreasing. 



8th Group, August 9 12 to August 16 0, declination increasing. 



9th Group, August 16 to August 23 11, declination decreasing. 



The mean of results from the 1st, 3rd, 5th, 7th and 9th groups was used for de- 

 creasing declination, and that of results from the 2nd, 4th, 6th and 8th, for increasing 

 declination. At the first six stations, and at Ballycastle and Passage West, the first 

 group was deficient. Thus the following Table was formed. 



13 3, declination decreasing. 

 19 19, declination increasing. 

 27 4, declination decreasing. 



