Pantiles were almost universally used for roof-coverings in the towns, while in the country thatching was freely employed. Under certain conditions the good qualities of pantiles show conspicuously. Where the country is level and the landscape low, and big changing sky-effects constantly recur, they look particularly homely and suitable. Their curved surfaces quickly respond to play of light, becoming successively bright in the sunlight or mellow-toned in the shadow. They have the appearance, too, of being well able to withstand the wind and the rain. Holland is a country having the attributes for the successful use of these tiles; moreover, they blended in every way with the prevailing brick architecture, both of the towns and of the villages, as is shown by the illustrations from Haarlem (page 29) and St. Laurens (page 31). They were not always of that bright red colour usually associated with pantiles. Many were made from a grey clay and look not unpleasing; especially in the town and neighbourhood of Zutphen they can be well observed. The thatched roofs of the countryside do not present any special characteristics. They were contrived to accomplish their purpose in a straightforward way. Brought down directly from ridge to eaves, or arranged pyramidally, they have no added decoration in straw-work. The ridge was protected by a course of half-round tiles of which the farmhouse at Spaarwoude (page 30) furnishes an example, and the roof of this building, arranged part in thatch and part in pantiles, is an instance of a fairly prevalent practice. Passing from the consideration of building materials to that of planning, it may be stated as a general rule that the ground plans of the old work were usually determined by the exigencies of practical requirements. The very narrow frontage of many of the houses gave little latitude for variation of interior disposition: for it will be noticed that the majority of the houses were built with gable-ends facing to the streets, and these consequently became the principal elevations. The measurement from front to back of each was thus much greater than that from side to side. The economical and practical way of treating such an area would be to arrange a passage at the side, directly through from front to back, which would, as well, give access to the rooms and stairs; and this is what was generally done. Such a passage, sketched from the outside pavement, is shown on this page. This expedient was not necessary when the building had a wider frontage, and in such a case the way through was often placed more or less centrally, in the manner illustrated from Alkmaar on page 33. On the other hand, the narrow house at Hoorn (page 34) has a central entrance, and here it gives immediate access to the front room. But the passage was an important feature of Dutch planning and gave the fundamental idea for general disposition.