The _content_ of a concept is _all that it includes--its full meaning_. The _extension_ of a concept depends upon its _quantity_ aspect--it is its property of including numbers of individual objects within its content. The _intension_ of a concept depends upon its _quality_ aspect--it is its property of including class or common qualities, properties or attributes within its content. Thus, the _extension_ of the concept _horse_ covers all individual horses; while its _intension_ includes all qualities, attributes, and properties common to all horses--class qualities possessed by all horses in common, and which qualities, etc., make the particular animals _horses_, as distinguished from other animals. It follows that the larger the number of particular objects in a class, the smaller must be the number of general class qualities--qualities common to all in the class. And, that the larger the number of common class qualities, the smaller must be the number of individuals in the class. As the logicians express it, "the greater the extension, the less the intension; the greater the intension, the less the extension." Thus, _animal_ is narrow in intension, but very broad in extension; for while there are many animals there are but very few qualities common to _all_ animals. And, _horse_ is narrower in extension, but broader in intension; for while there are comparatively few horses, the qualities common to all horses are greater. The cultivation of the faculty of Generalization, or Conception, of course, depends largely upon _exercise_ and _material_, as does the cultivation of every mental faculty, as we have seen. But there are certain rules, methods and ideas which may be used to advantage in developing this faculty in the direction of clear and capable work. This faculty is developed by all of the general processes of thought, for it forms an important part of all thought. But the logical processes known as Analysis and Synthesis give to this faculty exercise and employment particularly adapted to its development and cultivation. Let us briefly consider these processes. * * * * *