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The mechanical act of respiration merely serves to change the air contained within the air-receptacles. In the insects, this entire process is reversed; the air is carried by branching tubes to receptacles of blood scattered throughout the body; the blood-channels terminate in blood-extremities, and a capillary net-work of air-vessels is spread over these.
The hilt of solid gold, eight- sided and notched, was cross-chiselled in a delicate but deep design, picked out with rough gems, set with cunning irregularity; the guard, a hollowed disk of steel, graven and inlaid in gold with Kufic characters; the blade, as long as a man's arm from the elbow to the wrist-joint, forged of steel and silver by a smith of Damascus, well balanced, slender, with deep blood-channels scored on each side to within four fingers of the thrice-hardened point, that could prick as delicately as a needle or pierce fine mail like a spike driven by a sledge-hammer.
The lymph spaces and blood-channels of the eye are large, as compared with the mass of its tissue colloids. In these spaces and channels must be sought a means for rapid response to the need for regulation of intra-ocular tension.
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