Let us consider the various modes of reproduction proper to vegetables. Reproduction, or rather the fecundation which precedes it, is executed in certain vegetables, by means of an apparatus of the same typical form as that of the animal kingdom. It is composed of a male organ, the stamen, which contains the impregnating dust, pollen, and of a female organ, the ovary, supported by a stalk, the pistil. The pollen impregnates the ovula contained in the grains of pollen in the ovary, as the seed of the male impregnates the ovula contained in the egg of the animal. In both cases the fruit of the impregnation develops itself afterwards with the aid of warmth and time. The vegetable egg grows and ripens, just as the animal egg grows and ripens. We may add that the analogy between the modes of reproduction, in the two kingdoms, animal and vegetable, does not limit itself to these conditions of likeness; we may observe resemblances in the specialities of the function. Particular vitality, a turgid state of the tissues, accompanied by elevation of the local temperature, occur in the case of certain plants at the moment of impregnation, especially in the species of the family of Aroïdes. On placing a thermometer, at that time, in the great floral covering of the Arums, an excess of from 1° to 2° on the temperature of the surrounding air will be denoted, an extraordinary fact in vegetable life, for vegetables are always colder than the external air. How can we believe that the plant in which this excitement takes place has no feeling of its own condition? The plant, like the animal, has its seasons of love, can it be that it has no consciousness of them? Are we to believe that the plant which becomes warm, in which life rises at the moment of impregnation, has no more sensation than a stone? Such is not our opinion. We cannot understand life without sensibility--the one appears to us to be the indication of the other. The analogy between the plant and the animal in their functions of reproduction is nowhere more evident or more curious than in a vegetable production which abounds in the waters of the Rhône, and has received the name of _Vallisneria spiralis_. In this plant the male and female organs are placed on different branches of the same plant. The female flowers are fixed to the ground by long, twisted, spiral stalks. But, when seeding time comes, the spirals of the stems unroll themselves, and the female flowers come up to the surface of the water and spread themselves out. The male flowers, not being placed like the female on elastic stems, cannot come up to the surface of the water. What do they do? They burst through their covering, and float around their females on the surface of the water. After that the current carries away the detached male flowers; and the female stem folds itself up again, and sinks to the bottom of the river, there to ripen its impregnated ovules.