re croissant des premieres lignes soit tout a fait
saisissant, meme pour l'oeil le plus distrait.

J'ai adopte deux modeles d'experience. Le second modele me parait etre un
perfectionnement du premier; je les decrirai tous deux, voulant decrire
successivement tous mes essais; meme les moins heureux peuvent nous
apprendre quelque chose.

Ce chapitre sera consacre a la description du premier modele.

Apres quelques tatonnements, j'ai adopte la serie des 12 lignes suivantes:

TABLEAU DES LIGNES DESTINEES A PROVOQUER UNE SUGGESTION
D'ACCROISSEMENT

Ordre des lignes. Longueur. Ordre des lignes. Longueur.
1 12mm 7 72mm
2 24 Piege 8 72
3 36 9 84
4 48 Piege 10 84
5 60 11 96
Piege 6 60 Piege 12 96

On remarquera, en examinant ce tableau, que les lignes n'augmentent pas
suivant une progression geometrique, mais seulement suivant une progression
arithmetique; la difference entre les lignes successives est constante,
elle est de 12 millimetres. J'avais d'abord eu l'idee d'adopter une
progression geometrique dont l'avantage est que les lignes successives sont
toujours dans le meme rapport, presentent la meme augmentation relative
de longueur. D'apres la loi de Weber, de telles lignes presentent la meme
difficulte d'appreciation; mais a la reflexion, il m'a semble que si la
difference de longueur entre les premiers termes de la serie geometrique
est rendue assez forte pour creer rapidement une suggestion puissante,
d'autre part, lorsqu'on arrive au terme ou la progression doit cesser,
la progression reste si forte qu'on ne pourrait probablement pas
l'alterer--pour les besoins de la suggestion--sans eveiller l'attention de
beaucoup de sujets. Pour ce motif, j'ai donne la preference a la serie qui
suit un

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