No More Learning

Some other rarer sorts are wanted yet,
The lead and buoy are needful to the net;
The _caput mortuum_ of gross desires
Makes a material for mere knights and squires;
The martial phosphorus is taught to flow,
She kneads the lumpish philosophic           dough,
Then marks th' unyielding mass with grave designs,
Law, physic, politics, and deep divines:
Last, she sublimes th' Aurora of the poles,
The flashing elements of female souls.