Articles of many curious kinds have been observed passing through the post from time to time, some of them dangerous or prohibited articles, which, according to rule, are sent to the Returned-letter Office--the fact showing that the Post-office is not only called upon to perform its first duty of expeditiously conveying the correspondence intrusted to it, but is made the vehicle for the carriage of small articles of almost endless variety. Some of these are the following, many of them having been in a live state when posted--viz., beetles, blind-worms, bees, caterpillars, crayfish, crabs, dormice, goldfinches, frogs, horned frogs, gentles, kingfishers, leeches, moles, owls, rabbits, rats, squirrels, stoats, snails, snakes, silk-worms, sparrows, stag-beetles, tortoises, white mice; artificial teeth, artificial eyes, cartridges, china ornaments, Devonshire cream, eggs, geranium-cuttings, glazier's diamonds, gun-cotton, horseshoe nails, mince-pies, musical instruments, ointments, perfumery, pork-pies, revolvers, sausages, tobacco and cigars, &c., &c. Occasionally the sending of live reptiles through the Post-office gives rise to interruption to the work, as has occurred when snakes have escaped from the packets in which they had been enclosed. The sorters, not knowing whether the creatures are venomous or not, are naturally chary in the matter of laying hold of them; and it may readily be conceived how the work would be interfered with in the limited space of a Travelling Post-office carriage containing half-a-dozen sorters, upon a considerable snake showing his activity among the correspondence, as has in reality happened. On another occasion a packet containing a small snake and a lizard found its way to the Returned-letter Office. Upon examining it next day the lizard had disappeared, and from the appearance of the snake it was feared that it had made a meal of its companion. Another live snake which had escaped from a postal packet was discovered in the Holyhead and Kingstown Marine Post-office, and at the expiration of a fortnight, being still unclaimed, it was sent to the Dublin Zoological Gardens. In the Returned-letter Office in Liverpool, a small box upon being opened was found to contain eight living snakes; but we are not informed as to the manner in which they were got rid of.