Excepting the terms pycnostyle and aræostyle, which are useful as expressing the greatest degree of closeness or of openness of intercolumniation consistent with well-proportioned arrangement, the others may be dispensed with. To designate one mode as _eustyle_, _par excellence_, is very much like saying that the proportions assigned to it, viz. 2·30′ or 2½ diameters, are the very best, and all the rest comparatively defective; according to which doctrine, the _monotriglyphic_ mode of intercolumniation usually employed by the Greeks in their Doric temples, and which answers to the character of pycnostyle, is not so well proportioned as what is emphatically called eustyle. Let it be whatever it may, as expressed in terms of the diameter of the columns, intercolumniation should always deserve the name of eustyle, or _well-proportioned_, by being such as satisfies the eye, and contributes to the particular character that befits the occasion and harmonizes with the other proportions of the structure. Pycnostyle, or _close spacing_, carries with it the expression of both richness and strength, the solids or columns being very little less than the voids or intercolumns. Aræostyle, or _wide spacing_,—and _ditriglyphic_ Doric intercolumniation may be called such,—produces an effect of openness and lightness, but also partakes of meagreness and weakness, owing to the want of sufficient apparent support for the entablature,—a very frequent fault in Modern Architecture, where frugality as to columniation has often been allowed to produce a degree of poverty which contrasts very disagreeably with that of the decoration affected by the Order itself. Intercolumniation ought to be made to depend in some measure upon the nature of the composition: a tetrastyle portico, for instance, or a distyle in antis, admits of wider intercolumniation than would be suitable for an octastyle, because pycnostyle, where there are only three intercolumns, would produce too great narrowness of general proportions for a portico. Hardly is there need for observing, that be their proportions what they may, the intercolumns in a colonnade or portico must be all alike; nevertheless in a Grecian Doric portico there is, as we have seen, some difference, the two extreme intercolumns being there narrower by the width of half a triglyph. There is, besides, another exception from the general principle, for the centre intercolumn of a portico was frequently made somewhat wider than the others, in order to mark the entrance, and the better to display and afford greater space for access to the door within.