"In some portions of Mars no structures are used at all, owing to the mildness of the climate and the total absence of inclemency in the slightest degree. In other portions the beautifully developed trees, and especially those that spread out their branches near the surface of the soil, are ample for the purposes of shelter. Still in others they have a sort of building which is a grand pavilion, embracing a vast area of territory, thousands of miles in extent, under the same roof or cover, which during certain periods of the year and day become luminous and transparent. The temples and gorgeous structures, cities, and magnificent edifices have been transferred in spiritual essence to the spiritual spheres, and have ceased to be as material entities, so when the planet passes into the spiritual condition outright and in toto, all that Mars could ever boast of in architectural grandeur and excellence is preserved and perpetuated with additional luster and beauty from the finishing spiritual touches by the Infinite Master Builder. And now you perceive that other questions come up right here and require recognition and treatment. Among them these: Do the people on Mars sleep? If so, how often and how much? "May 11. Why is it that you require repose in sleep? In the infinitely wise arrangement of all things there are amply satisfactory reasons for every demand, every requirement, every manifestation, and therefore there are reasons why sleep is induced and is an imperative necessity in your present and past states of existence. "When rest in sleep is long deferred from nervous derangements or other causes, your physicians administer narcotics to induce it, for they well know, as you all do, that sleep is necessary after intervals of wakefulness in order to protract your being in the form, and why? "You have voluntary and involuntary functions or organs; the voluntary only, the involuntary never, can be suspended for certain periods of time. Your respiration and blood circulation are involuntary, and as long as you remain embodied in flesh will continue to perform their appropriate functions, whether you wake or sleep, for they are not subject to or influenced by the will. And it is by the unconscious operation of these that your voluntary functions when suspended in sleep are replenished and reinvigorated. You are, as at present constituted, made up corporally of gross material, which becomes wearied and exhausted by the active exercise or operation of the voluntary functions, and the nerve force will expend itself unless periodically reimbursed and replenished, and restored to its normal condition by the intervention and recuperative power of sleep. When in the ages to come your people lose this grossness in their material composition, your inclination to sleep and the necessity for it will abate and become lessened correspondingly to your successive stages of advancement in progressive development.