I always find you in a state of feverish emotion which is the worst possible thing for you.

You must calm yourself, my dear fellow, and not allow anything to worry you." A few minutes later, though, just as he was going away, he said with his pleasant smile: "Do you know that a newspaper writer came to interview me about that explosion?
Those reporters imagine that scientific men know everything! I told the one who called on me that it would be very kind of _him_ to enlighten _me_ as to what powder was employed.

And, by the way, I am giving a lesson on explosives at my laboratory to-morrow.

There will be just a few persons present.

You might come as well, Pierre, so as to give an account of it to Guillaume; it would interest him." At a glance from his brother, Pierre accepted the invitation.