The effect of pottery upon the food habits of the people was profound. With vessels that could be placed directly on the fire whole new lines of food were available. Soups, stews, porridges and greens became commonplace. Many new plants were utilized and innumerable combinations of meats and plants were discovered. Pottery was also of great value for water storage. Baskets were not good for this because the moisture soon caused them to disintegrate. Pottery lasted indefinitely and each woman could make an unlimited number of large water jars. On rainy days every jar in the village could be filled and the terrors of drouth were lessened. Thus it is easily seen that the perfection of pottery was one of the major steps in the progress of the Indians. The diet was improved, the drudgery of cooking was lessened, the range of foods was widened, storage facilities were increased and the entire domestic economy of the people took a decided turn for the better. At first the pottery was crude but with each succeeding generation it improved. The proper percentage of temper and clay was discovered, designs were introduced and improved upon and vessel shapes became more graceful and efficient. As time passed the fingers of the potters became more and more deft. The adoption of a permanent house was also of great importance. Life in the open caves was never too comfortable. Heavy rains, deep snows and the bitter temperatures of winter held certain terrors for the people who were without actual dwellings. No great population could ever grow under such conditions. A permanent, secure house was needed to stabilize the culture. As we have already seen, the Basket Makers in at least one area began to experiment with permanent houses at an early date. It is not yet known whether these earliest houses developed into the standardized pithouses which spread widely over the area early in Modified Basket Maker times but we may be quite sure the people did not develop it entirely by themselves. Similar pithouses were used by Indians in many parts of America, in fact they can be traced up the northwest coast and on to Alaska and Siberia. Since this type of house was used so widely it is probable that the Basket Makers borrowed the idea from some neighboring tribe.