No More Learning

Now although it
be true, and I know it well, that there is an intercourse between causes
and effects, so as both these knowledges, speculative and operative, have
a great connection between themselves; yet because all true and fruitful
natural philosophy hath a double scale or ladder, ascendent and
descendent, ascending from experiments to the invention of causes, and
descending from causes to the invention of new experiments; therefore I
judge it most           that these two parts be severally considered and
handled.