Applying Zola's theory, sociology is to find here a very instructive record of how a woman such as Nana would comport herself when dying of small-pox; and furthermore, his description of it must be an exact record of an experiment in death from small-pox conducted by M. Zola in person. But now recurring to our question, let us ask, how could M. Zola conduct this experiment? It would certainly be inconvenient for him to catch the small-pox and die, with a view to recording his sensations; and yet it is perfectly apparent that the conditions of scientific experiment could not be satisfied in any other way. M. Zola would probably reply with effusion, that he had taken pains to go to a small-pox hospital and to study with great care the behavior of a patient dying with that disease. But, we immediately rejoin, this is very far from what his theory bound him to show us; his theory bound him to show us not some person, any person, dying of small-pox, but Nana with all her individuality derived from heredity and from her own spontaneous variation--it was Nana dying of small-pox that he must set before us; one person dies one way and another person dies another way, even of the same disease; Smith, a very tragic person, would make a death-scene full of tragic message and gesture; Brown might close his eyes and pass without a word; Nana, particularly, with her peculiar career and striking individuality, would naturally make a peculiar and striking death. Now since Nana is purely a creation of Zola, (unless indeed the novel is a biography, which is not pretended) Zola is the only person in the world who understands Nana's feelings in death or on any occasion; and this being so, it is simply impossible that Zola could make a scientific experiment of Nana's death from small-pox without dying himself. This seems so absurd that one goes back to _Le Roman Expérimental_ to see if Zola's idea of a scientific experiment has not something peculiar about it; and one quickly finds that it has. It is in fact interesting to observe that though Zola has this word experiment continually on his lips, yet he never means that the novelist is to conduct a real, gross, downright, actual brute of an experiment; and the word with him is wholly Pickwickian, signifying no more than that the novelist, availing himself of such realistic helps as he can find in hospitals and the like, is to evolve therefrom something which he believes to be the natural course of things. Examine the book wherever you may, the boasted experiment, the pivot of the whole system, fades into this.