From sun-worship to knowledge ......................... 7
Our own star ................................................... 12
A discovery with a strange history ................ 14
The project and its outline ............................ 41
We live on an enormous magnet ..................... 56
World-wide magnetic survey ......................... 94
Earth currents ................................................ 103
Heralds from distant worlds ....................... 108
The invisible belts of the earth ................... 134
When the sky is on fire ................................. 153
Invisible celestial light ............................... 173
The ionosphere ............................................... 182
Atmospherics—child of thunderstorms ......... 208
Does the sun make the weather? .................. 212
Galileo: “provando e riprovando” ................ 235
The findings of the iqsy are open to the
Whole world .................................................. 239

English