_Hasty and False Generalization_ is a common fallacy of this class. Persons sometimes see certain qualities in a few individuals of a class, and mistakenly infer that _all_ the individuals in that class must possess these same qualities. Travelers frequently commit this fallacy. Englishmen visiting the United States for a few weeks have been known to publish books upon their return home making the most ridiculous generalizations regarding the American people, their assertions being based upon the observation of a few scattered individuals, often not at all representative. Americans traveling abroad commit similar errors. A flying trip through a country does not afford the proper opportunity for correct generalization. As Brooks says: "No hypothesis should be accepted as true until the facts are so numerous that there can be no doubt of its being proved." _Fallacies of Observation_ result from incorrect methods of observation among which may be mentioned the following: (1) _Careless Observation_, or inexact perception and conception; (2) _Partial Observation_, in which one observes only a part of the thing or fact, omitting the remainder, and thus forming an incomplete and imperfect concept of the thing or fact; (3) _Neglect of Exceptions and Contradictory Facts_, in which the exceptions and contradictory facts are ignored, thereby giving undue importance to the observed facts; (4) _Assumption of Facts_ which are not real facts, or the assumption of the truth of things which are untrue; (5) _Confusing of Inferences with Facts_, which is most unwarrantable.