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tion that it is as least as small as. The multitude of a collection may be comparred to the huminosity of a color. Like huminosity, it is a serial respect or quantity. But even in the qualities of this respect, multitude, we find marked traces of the existential nature of collections. For all the quantities or serial respects in which substantial qualities differ are continuous; that is between any two grades, say of huminosity of a color, or of pitch of a note there is room for any multitude, however great, of others; while multitude on the contrary varies by discrete steps. This difference is due to the fact that a collection consists of