(135 
tion of prosecuting this investigation he did not yet publish his 
results. 
23. It seemed possible that the investigation of these amplitude- 
observations might contribute to the discovery of an explanation 
of the supplementary term found in the rates. I intended therefore 
to inquire whether the corrected amplitudes too would still show a 
yearly inequality. 
As H. G. VAN DE SANDE BAKHUYZEN gave leave to take advantage 
of his results for the present paper, his corrected amplitudes could 
be compared at once with each other for the period 1878—80. 
Furthermore I tried to execute a somewhat provisional investigation 
for the eight following years. For these years the monthly means 
of the amplitude found in a first approximation ') were corrected for 
the influence of the atmospheric-pressure, as found by H. G. van 
DE SANDE BAKHUYZEN. A correction for the temperature was not 
so easily applied, because it appeared that its influence has conside- 
rably increased in the course of the years. Finally I proceeded simply 
in this way, that I derived the value of the amplitude for + 8° R. 
for every spring and every. autumn by interpolations between monthly 
means corrected for the barometer-reading. 
The results have been brought together in the following table: 
= | Spring. ree | Autumn. | A.—S. 
(STS |. 377 38.22 39.71 + 1.49 
1879 38.68 38.76 37.66 — 1.10 
1880 98,8% 40.06 39 50 — 0.56 
1881 4A 27 40.48 40.47 — 0.01 
1882 39.70 39.18 39.19 + 0.01 
1885 38.66 35.42 35.67 + 0.25 
1884 32,19 30.70 29.22 — 1.48 
1885 29,20 30.55 28,35 — 2.20 
1886 31.90 82:30 32.33 + 0.05 
1887 32,71 „1.86 31.68 — 0,18 
1888 31.01 
1) As many observations are wanting the corresponding values had to be assumed. 
