On a subject of this kind, we can consult the Spider of the waste-lands.  I catch an old Lycosa in the fields and house her, that same day, under wire, in a burrow where I have prepared a soil to her liking.  If, by my contrivances and with a bit of reed, I have previously moulded a burrow roughly representing the one from which I took her, the Spider enters it forthwith and seems pleased with her new residence.  The product of my art is accepted as her lawful property and undergoes hardly any alterations.  In course of time, a bastion is erected around the orifice; the top of the gallery is cemented with silk; and that is all.  In this establishment of my building, the animal’s behaviour remains what it would be under natural conditions.

But place the Lycosa on the surface of the ground, without first shaping a burrow.  What will the homeless Spider do?  Dig herself a dwelling, one would think.  She has the strength to do so; she is in the prime of life.  Besides, the soil is similar to that whence I ousted her and suits the operation perfectly.  We therefore expect to see the Spider settled before long in a shaft of her own construction.

We are disappointed.  Weeks pass and not an effort is made, not one.  Demoralized by the absence of an ambush, the Lycosa hardly vouchsafes a glance at the game which I serve up.  The Crickets pass within her reach in vain; most often she scorns them.  She slowly wastes away with fasting and boredom.  At length, she dies.

Take up your miner’s trade again, poor fool!  Make yourself a home, since you know how to, and life will be sweet to you for many a long day yet:  the weather is fine and victuals plentiful.  Dig, delve, go underground, where safety lies.  Like an idiot, you refrain; and you perish.  Why?

Because the craft which you were wont to ply is forgotten; because the days of patient digging are past and your poor brain is unable to work back.  To do a second time what has been done already is beyond your wit.  For all your meditative air, you cannot solve the problem of how to reconstruct that which is vanished and gone.

Let us now see what we can do with younger Lycosae, who are at the burrowing-stage.  I dig out five or six at the end of February.  They are half the size of the old ones; their burrows are equal in diameter to my little finger.  Rubbish quite fresh-spread around the pit bears witness to the recent date of the excavations.

Relegated to their wire cages, these young Lycosae behave differently according as the soil placed at their disposal is or is not already provided with a burrow made by me.  A burrow is hardly the word:  I give them but the nucleus of a shaft, about an inch deep, to lure them on.  When in possession of this rudimentary lair, the Spider does not hesitate to pursue the work which I have interrupted in the fields.  At night, she digs with a will.  I can see this by the heap of rubbish flung aside.  She at last obtains a house to suit her, a house surmounted by the usual turret.