One believes in X, another in Z, and, like all believers, they do not see the idiocy of their beliefs.

They believe quia absurdum, because, in reality, if they did not believe in a stupid way, they would see the vanity of all that these brigands prescribe for them.

Scarlatina is a contagious disease; so, when one lives in a large city, half the family has to move away from its residence (we did it twice), and yet every man in the city is a centre through which pass innumerable diameters, carrying threads of all sorts of contagions.

There is no obstacle: the baker, the tailor, the coachman, the laundresses.
"And I would undertake, for every man who moves on account of contagion, to find in his new dwelling-place another contagion similar, if not the same.
"But that is not all.

Every one knows rich people who, after a case of diphtheria, destroy everything in their residences, and then fall sick in houses newly built and furnished.