It's often been observed that the first casualty of war is the truth. But that's a lie, too, in its way. The reality is that, for most wars to begin, the truth has to have been sacrificed a long time in advance. ↗
We travellers are in very hard circumstances. If we say nothing but what has been said before us, we are dull and have observed nothing. If we tell anything new, we are laughed at as fabulous and romantic. ↗
Moreover, photography has made it possible to fix these images and now provides us with a permanent record of each observed spectrum, which can be measured out at any time. ↗