( 204 ) 
1st. The number of Spasms detected depends upon the breadth 
and distinctness of the curves, which are very variable during the 
registering-period 1883—’99. 
2nd, During a very unsettled state of the Magnet it was often 
impossible to distinguish between the various kinds of disturbances. 
3rd, The possibility exists, that many earthquakes have not been 
noticed, though I had made extracts formerly from the statistics of 
earthquakes published in the “Natuurkundig Tijdschrift voor Neder- 
landsch Indië”. 
Only the difficulty mentioned under 1 is unevitable, and indeed 
its baneful influence has been keenly felt. 
I searched the Magnetograms of the continuous series from March 
27 1883 till March 27 1899; for the undulations only the years 
with narrower curves. 
ANNUAL NUMBERS. 
| — 
| Year ke | Period. bes 
| | 
Sun-spot maximum (27 ILL-31 XIT) 1883 | (87) | 27 II 1883-27 1111884. 55 
| » 84. | 43 | » 84- » 85 50 
> s5| 64 | » 85- » 86 | 58 
) 86 74 » 86-— » 87 81 
» £7 68741} dend SS 54 
| > 88 | 43 it CRRA de A ded 36 
(1889.6) » 89 31 » BOE?) Sp 90 | 51 
Sun-spot minimum: | 
| » UO) SF y 905 » )] 46 
> Oi 45 | ye, Dey > 92 44. 
) 92] 57 Di Dero IB 53 
» 93 83 ele eye wes Pm 94. 88 
(1894.0) » EM i » DD» 95 74 
Sun-spot maximum | 
» 95 103 > 95-— » 96 122 
» 96 114 DIB » oF 106 
» 97 | 105 DE MED T=, AD 98 | 96 
» 95 | 89 » 98- » 99 | 99 
» 99 | (20) | 13 
Total 1130 
If we take into account, that especially in the years 1888—91 
