ON ELECTROLYSIS AND ELECTRO-CHEMISTRY. 931 
It is also proposed to print forthwith, and circulate among those most 
likely to be interested, revised proofs of the portions which have been 
completed, but not to include them in the published Report for this year. 
It is intended to publish them in the Report for 1897, with the remainder 
of the work that the Committee are able to put before the Association. 
The Committee therefore ask for reappointment, with the addition of 
the name of Mr. E. H. Griffiths, and with a grant of 50/, 
Comparison and Reduction of Mgiiaes Observations.—Report of the 
Conmmittee, consisting of Professor W. G. Adams (Chawman), Dr. 
C. CREE (Secretary), Lord KeELvin, Professor G. H. Darwin, 
Professor G. CurystaL, Professor A. SCHUSTER, Captain H. W. 
CreAK, The AsTROoNOMER Roya, Mr. WILLIAM ELLIS, and Pro- 
fessor A. W. Rtcxer. (Drawn up by the Secretary.) 
CoNTENTS. 
Nen-cyclic Effects at Kew Observatory during the selected ‘Quiet’ Days of 
the Siw Years, 1890-1895. By C. Cures, Sc.D. 
SECTIONS PAGE 
1. Introductory Remarks: ‘ Non-cyclic’ Effect . ; ; é F 5) pul 
2. WNon-cyclic Effects during Siw Years, 1890-1895. ; : ; . 231 
3. Relation of Non-cyclie Effects to Annual Changes . ; : : . 233 
4-6. Mean Annual Values from ‘ Quiet’ and Unrestricted Days . : . 234 
7-8. Relation of Non-cyclic Effects to Diurnal Ranges . : : é . 235 
9. Relation of Non-cyclic Effects to Diurnal Ine ae : : , . 236 
10. Llimination of Non-cyclic 5 be : : : : . 236 
11-12. Associated Phenomena . : ; : : : : . 237 
APPENDIX.—Remarks by W. ELLIS, PF R. 8. : : : : 5 : . 238 
Introductory Remarks: ‘ Non-cyclic’ Effect. 
§1. An analysis of the results from the Kew declination and_hori- 
zontal force magnetographs during the selected ‘quiet’ days of the five 
years, 1890 to 1894, was submitted last year to the Committee and 
adopted as its report for 1895. The corresponding inclination and 
vertical force results had also been pretty fully worked up, but I held 
them over pending an inquiry into the sufficiency of the temperature 
correction. Some considerable time may elapse before these results can 
be utilised to full advantage. It has thus seemed inexpedient to defer 
dealing with one set of phenomena whose general character is unaffected 
by any uncertainty as to the temperature correction, and whose existence 
seems to render desirable a reconsideration of the whole system of ‘quiet’ 
day observations. The phenomena in question bear on what I termed 
last year the non-cyclic effect. 
Supposing H, and H,, to denote mean values of the horizontal force 
at the first and second midnights of a selected series of days, then 
H,,—Hp was defined as the non-cyclic effect or variation of horizontal 
force ; and a similar definition applies in the case of any other element. 
Non-cyclic Effects during Six Years, 1890-1895. 
§ 2. It is propasad to give here complete data as to the non- cyclic 
effects in the selected ‘quiet’ days at Kew during the last six years. To 
some extent this incorporates results given last year, but it seemed 
