However, the proprietor seemed to draw redoubled courage and strength from consciousness of her rights. She encamped permanently on the nest and received the other bee each time that she ventured to approach with an irritated quiver of the wings in token of just indignation. The stranger finally withdrew discouraged, and instantly the mason resumed work as actively as if she had not undergone the chances and changes of a long journey. Yet another word as to rights of property. While a mason bee is absent it is not unusual for some homeless vagabond to visit the nest, take a liking to it, and set to work, sometimes at the same cell, sometimes at the next, if there are several free, as often happens with old nests. When the first occupant returns she does not fail to drive away the intruder, who always ends by getting the worst of it, so lively and invincible is the real owner’s sense of property. Reversing the savage Prussian maxim, “Strength before right,” here right comes before strength; otherwise the constant retreat of the intruder would be quite inexplicable, since the latter’s strength is in no way inferior to that of the real owner. If she has less audacity it must come from not feeling braced by the sovereign strength of being right, which decides among equals, even in the brute creation. The second of my two travellers did not appear, either on the day when the first came, nor later. I decided to make another experiment—this time with five subjects. Place of starting and arrival, distance and hours, were the same. I found three at the nests on the following day; two were missing. It is therefore quite clear that Chalicodoma muraria carried away four kilometres, and, set free where she certainly could never have been before, can return home. But why did one out of two, and two out of five, fail to do so? What one could do, why not another? Are they not equally gifted with the faculty which guides them through the unknown? Is it not rather inequality in the power of flight? I recollected that my Hymenoptera did not all fly off with the same energy; hardly were some out of my fingers, launching themselves impetuously into the air, than I lost sight of them, while others let themselves drop a few paces off after a short flight. It seems certain that these had suffered during the journey—perhaps from the concentrated heat in the furnace of my box, or I may have harmed the jointure of the wings while marking them—an operation difficult to perform when one has to avoid being stung. These are maimed, weak creatures—unable to go on with all sail spread, as they ought, for this journey. The experiment must be tried again, only counting those bees which instantly leave my fingers with a swift, strong flight. We shall omit those which hesitate or linger close by on some bush. Moreover, I will do my best to compute the time employed in returning to the nest.