84 Proceedings. 



Example for Ko tide : — 



If the following lines aie used from the list : — 

 (185 - 97) ; (96 - 8j 



— i.t., equal intervals of 88 day.s — then the S. tides arc eompletely eliminated, and 

 the maximum value is obtained foi' the Ko tide. 



If the following lines aie used (when the observations extend over a year), a 

 further value is obtained : — 



(362 - 274); (273 - 185). 



The selection of these lines and the sums from the list is shown in detail 

 on the sehedule, giving the 24 values of Df, which are subjected t<j analysis. 

 Si and SfiA +/ are next formed, and then A/. The calculation of the values of 



S 5 



Fk' = S At sin (9 + t) »k and G^' = 1' At cos (9 + t) (k is most readilv done on the 



o o 



calculating-machine. The corrections due to the tides M 2, N, L, V, T, and R are 

 calculated and applied to F and G. The rest of the calculation is shown on the 

 schedule, where comparisons with the residts in Vol. xvi of the Indian Survey, 

 (p. 296) are also given, the differences in the values of' a and R being 4'745° and 

 0-0020 ft. 



Reference must be macle to Dr. Borgen's paper for details of the method. The 

 whole of the calculation is, howt'ver, given in full, and the brevity of the method 

 will be appreciated by those who have had experience in the analysis of tidal 

 observations. 



For the other tides more lines from the list of sums are used : but even then 

 the labour of analysing a year's observations is estimated by Dr. Borgen to be 

 about a tenth of the labour of the method proposed by Sir W. Thomson and Mr. 

 Roberts, and to be about a third or a half of that of Darwin's abacus. 



8. "The Tiine-control of the Wellinytoii Tide-gauge,'' bv C. E. 

 Adams, M.Sc, F.R.A.8. 



Abstract. 



Owing to the situation of the Wellington tide-gauge* in one of the cargo-sheds 

 on the wharf, it w-as considered desirable to have an independent control of the 

 time, for owing to the vibrations of the shed the gauge-clock's late has been found 

 to vary irregularly, and the clock has occasionally been stopped by the vibrations. 

 A time-control has been attached to the pencil-carriage, carrying a small plunger 

 in circuit with the Observatory clock, and by means of this plunger a mark is made 

 on the record-paper every mean solar hour. The distance between the pencil and 

 the plunger is ri4in., the line joining them being always at right angles to the 

 axis of the cylinder. it is found that the tide-gauge clock runs regularly while 

 undisturbed by cargo-shifting, but that at other times its rate is affected by the 

 vibrations of the shed. 



9. " Further Cuntributions to tlie C'heiiiistry of tlic Flora of New 

 Zealand," bv Professor Eastertiehl. 



10. '■ Notes on tlie Lcpidoptera luhled to tlio Collection in the Do- 

 minion Museum during the Season 190!)-10," by H. Hamilton, A.O.S.M. 



11. " Some Recent Discoveries of Moa-bones." by A. Hamilton, F.L.S. 

 \'l. "Notes on Some Strange and Hare l'"ishes."' bv A. Hamilton, 



F.L.S. 



lo. " Sponges from the Kermadees,'" by Profes^or Kirk. 



14. "Chemistry and T(.\ieo]ogv of New Zealand Plants," by B. C. 

 Aston, F.C.S. 



15. "List of Indigenous Phanerogamic Plants of the Wellington Pro- 

 vince," by B. C. Aston, F.C.S. 



16. "A Fnrtlier Botanical l^'^xplorat ion of tlie Taiai'uas. ' " by B. C. 

 Aston, F.C.S. 



17". "Notes and Descriptions of New Zealand Ij pidopti' ra .'' by E. 

 Meyrick, B.A., F.R.S., F.Z.S. 



■Trans. '^Z. Tiist., Vol xji, p. 407. 



