“Into every instinctive act there is an intrusion of reasoned act.” No doubt; but in the case of the terns--sea-frequenting and sea-loving--which had not the wit to lay their eggs beyond the reach of spring tides, the reasoning is the merest intrusion. Yet an instance of what seems to be the reasoned act of a wasp may be cited. The insect had selected a dead log of soft wood as a site for its egg-shaft. It was at a spot to which the occupations of the season took me daily, so that the boring operations were watched from beginning to end. The work was done rapidly and neatly, and when all was ready for the deposit of the eggs the insect constructed from papier-mache-like material a disc-shaped lid exactly fitting the mouth of the excavation, to which it was attached on its upper edge by a hinge. Then round and about the disc similar stuff was plastered, so as to form an irregular splash, imitative of a bird's droppings to the-degree of perfect deception. In the centre was the lid with the hinge, and whensoever the insect visited its nursery the lid swung up, closing behind it. On departure it fell into position. Unless the insect by its presence betrayed its secret, the shrewdest observer at close quarters would have been misled. There are reasons for the belief that green tree-ants understand and respect the laws of neutrality. There are several communities in the mango-trees, and since some of the trees overhang the fence, the top wire is used as a highway. When a gate is opened traffic is suspended. In a minute or two of a busy day there will be considerable gatherings on the latch-style, and if the intervening space is narrowed by the swing of the gate the impatient insects begin to make a living bridge across the perilous gap. At one particular gate, which is opened and shut many times a day, it has been noticed that the ants never seem to resent interruptions or to be vexed by them. If they happen to get on the hands or fingers, they submit to be restored to the gate; but go to the formicary on the mango-tree half a dozen yards away and offer a friendly finger, and you will find dozens of pugnacious individuals ready to defend their home. Do they recognise that they are but pilgrims of the fence, enjoying certain rights on sufferance, that it is a path of peace on which belligerents must not intrude, a neutral tract under the custody of the law of nations, which ants, as well as men, must respect? Whatsoever the reason, the deportment of the truculent ant on the highway is that of an upholder of peace at any price. It is to be doubted if the animal world holds more illustrious examples of heroism than a green tree-ants' nest. Two or three individuals may be despised as long as their assaults are confined to the less sensitive parts of the body; but let a huge colony up among the branches of an orange-tree be disturbed, and the first army corps instantly mobilised, and it will not be cowardly hastily to retreat. So eager for the fray are