The beams of April, ere it goes, A worm, scarce visible, disclose; All winter long content to dwell The tenant of his native shell. The same prolific season gives The sustenance by which he lives, The mulberry leaf, a simple store, That serves him--till he needs no more! For, his dimensions once complete, Thenceforth none ever sees him eat; Though till his growing time be past Scarce ever is he seen to fast. That hour arrived, his work begins. He spins and weaves, and weaves and spins; Till circle upon circle, wound Careless around him and around, Conceals him with a veil though slight, Impervious to the keenest sight. Thus self-inclosed, as in a cask, At length he finishes his task: And, though a worm when he was lost, Or caterpillar at the most, When next we see him, wings he wears, And in papilio pomp appears; Becomes oviparous; supplies With future worms and future flies The next ensuing year--and dies! Well were it for the world if all Who creep about this earthly ball, Though shorter-lived than most he be, Were useful in their kind as he. It has been already noticed that the progressions of the insects are accelerated by an increase of temperature; and some variation will equally be experienced where different modes of treatment are followed; and, in particular, where different periods of the year are chosen in which to produce and rear the worm. Malpighius, in his “Anatomy of the Silk-worm,” says, that worms which he hatched in May were eleven days old ere they were attacked by their first sickness; others hatched in July were ten days, and those brought forth in August nine days, before they refused their food, preparatory to their first moulting. Eight days appear to be the most usual term for their first attack; and by his judicious treatment count Dandolo shortened even this term by two days. In Europe, except where recourse is had to artificial aid, the term of the caterpillar state is usually that which has been already mentioned.