According to the opinion of some of the Rabbis, the Israelites did not really dwell in booths in the wilderness, but were surrounded by clouds--by seven clouds. Four clouds, one at each of the four sides; a fifth, a shadow, to protect them from the hot rays of the sun; the sixth, a pillar of fire to give them light by night (they being able to see as clearly by night as by day); and the seventh, to precede their journeying and direct their way. The children of Israel departed from Egypt in _Nissan_ (April), and obtained immediately these booths, which they made use of for forty years. Thus they were in booths during the entire cycle of the year, and we could as easily commemorate this fact in the spring as in the fall, in the summer as in the winter. Why, then, has God made autumn, and neither spring nor summer, the season of observance? Because if we dwelt in booths in the summer, it would be a question whether we did so in obedience to God's behest or for our own gratification; for many people seek airy retreats during this season; but in the fall, when the trees lose their leaves, and the air grows cold and chilling, and it is the time to fix our houses for the winter, then by inhabiting these temporary residences, we display our desire to do as our Creator has bidden us. The Feast of Tabernacles is also the Feast of Ingathering, when we should thank God for the kindness shown us and the treasure with which He has blessed us. When the Eternal has provided man with his sustenance, in the long evenings which follow he should meditate and study his Bible, and make this indeed a "feast to the Lord," and not entirely for personal gratification. The four species belonging to the vegetable kingdom which we use in this festival, are designed to remind us of the four elements of nature, which work under the direction and approval of the Most High, and without which all things would cease to exist. Therefore the Bible commands us on this "feast of the Lord," to give thanks, and bring before Him these four species, each typifying one of the elements. "Ye shall take for yourselves the fruit of the tree _hadar_" (the citron). Its color is high yellow and resembles fire. The second species is the palm branch (Heb. _Lulab_). The palm is a high tree, growing up straight in the air, and its fruit is sweet and delicious to the taste; this then represents the second element, air. The third is the bough of the myrtle, one of the lowliest of trees, growing close to the ground; its nature, cold and dry as earth, fits it to represent that element. The fourth is "the willow of the brook," which grows in perfection close beside the water, dropping its branches into the stream, and symbolizing thus the last element, water. The Bible teaches us that for each of these four elements we owe special thanks to God.