The tiny animal is wrapped in a tightly closed tunic which embraces it snugly. This is a temporary skin, a sheath which the new-born larva will shed on leaving the egg. This sheath is connected with an appendage, a capsule placed under the lid. The twisted stem hanging from the burst bubble when it is shot out of the egg represents the communicating duct. Very slowly, as the little creature takes shape and grows, this bladder-like reservoir receives the products of the respiration which takes place under the cover of the tunic or “overall.” Instead of dispersing outside, through the egg-shell, the carbonic acid gas incessantly resulting from the vital process of oxidization accumulates in this sort of gasometer, filling and distending it and pressing upon the lid. When the little Bug is mature and on the point of hatching, the increased activity of its respiration completes the inflation, which has doubtless been proceeding ever since the earliest development of the germ. At last, yielding to the increasing pressure of the gas-filled capsule, the lid becomes unfastened. The Chick in its shell has its air-chamber: the young Reduvius has its bomb of carbonic acid gas: it releases itself by breathing. The singular hatching-processes of the Pentatoma and the Reduvius are obviously not isolated cases. The egg with a removable lid must be employed by other Hemiptera; it may even be that this is a fairly general device. Each genus has its own methods of opening its box, its own system of springs and levers. What a mechanism to find in the egg of a Bug, and how fertile in surprises! What an interesting harvest to be reaped, with patience and a good pair of eyes!