Its situation and office prove that it is there we must look for the issue of the seminal fluid, if we can hope to find an opening, when not engaged in copulation. We found this new part in the first drone we dissected. By pressing the seminal vessels, the white liquid then escaped downwards to the root of the penis r. and into the lenticular body, l. i. which became sensibly swoln. We prevented the fluid from returning, and by new pressure of the lentil forced it to advance. However, none escaped, but we saw at the posterior end of the lenticular body, and under the scaly pincers, a small white cylindrical substance, the same in appearance as that we had found engaged in the vagina of the queen. This part retracted on pressure, and then returned. I request you, Sir, while perusing this letter, to inspect the figure of the male sexual organs published by M. de Reaumur, and which are copied here. The descriptions are most accurate, and present a just idea of the situation of these parts when in the male's body. We readily conceive how they appear when left in the female by copulation. This detail will sufficiently indicate the situation and figure of the new part I have discovered. I suspect that the males perish after losing their sexual organs. But why does nature exact so great a sacrifice? This is a mystery which I cannot pretend to unveil. I am unacquainted with any analogous fact in natural history, but as there are two species of insects whose copulation can take place only in the air, namely, ephemerae and ants, it would be extremely interesting to discover whether their males also lose their sexual parts, in the same circumstances, and whether, as with drones, enjoyment in their flight is the prelude of death. FINIS. FOOTNOTES: {O} Memoires sur les Abeilles, p. 450. {P} Such long and minute descriptions can be very imperfectly translated; indeed they are unintelligible without microscopical inspections of the parts themselves.--T. ANALYTICAL INDEX.