The determination of an ocean surrounding the inhabited earth he declared to be based on a mere hypothesis and that it would be equally allowable to describe the Erythraea as a sea surrounded by land.
The act had always been accounted allowable in the school, if circumstances should call for it: indeed, the first three teachers had found such circumstances.
It is allowable to deceive an enemy by fabricated despatches purporting to come from his own side; by tampering with telegraph 1112Ssages; by spreading false intelligence in newspapers; by sending pretended spies and deserters to give him untrue reports of the numbers or movements of the troops; by employing false signals to lure him into an ambuscade.
As has been remarked above, the terror of postbaptismal sin and the fact that only one restoration was allowable influenced many as late as the 4th century to remain catechumens all their lives, and, like Constantine, to receive baptism on the deathbed alone.
Given a certain allowable heat transmission, the principal points to be considered in connexion with insulation are, first cost, durability, weight and space occupied, the two last named being specially important factors on board ship. No exact rules can be laid down, as the conditions vary so greatly; and though experiments have been made to determine the actual heat conduction of various materials per unit of surface, thickness and temperature difference, the experience of actual practice is at present the only accepted guide.
It is a well-ascertained fact that the insulator, gutta-percha, is, when kept under water, practically imperishable, so that it is only the original strength of the sheathing wires and the deterioration allowable in them that have to be considered.