which, with him, was sign of the profoundest attention.

“Since you have been employing your brain in studies of an exalted character, in important calculations, and so on, the head has gained a certain advantage, so that your head is now too full of science.”

“Do you think so?”

“I am sure of it. The result is, that, instead of allowing any foreign matter to penetrate the interior of the head, your bony box or skull, which is already too full, avails itself of the openings which are made in allowing this excess to escape.”

“Ah!” said Porthos, to whom this explanation appeared clearer than that of the doctor.

“The five protuberances,