r diameter of the earth is
shorter than the equatorial diameter. Tell him that the succession of
summer and winter is caused by the revolution of the earth round the
sun. If he does not set you down for an idiot, he lays an information
against you before the Bishop, and has you burned for a heretic. To do
him justice, however, if he is ill informed on these points, there
are other points on which Newton and Laplace were mere children when
compared with him. He can cast your nativity. He knows what will happen
when Saturn is in the House of Life, and what will happen when Mars is
in conjunction with the Dragon's Tail. He can read in the stars whether
an expedition will be successful, whether the next harvest will be
plentiful, which of your children will be fortunate in marriage, and
which will be lost at sea. Happy the State, happy the family, which
is guided by the counsels of so profound a man! And what but mischief,
public and private, can we expect from the temerity and conceit of
scolists who know no more about the heavenly bodies than what they have
learned from Sir John Herschel's beautiful little volume. But, to speak
seriously, is not a little truth better than a great deal of falsehood?
Is not the man who, in the evenings of a fortnight, has acquired a
correct notion of the solar system, a more profound astronomer than a
man who has passed thirty years in reading lectures about the primum
mobile, and in drawing schemes of horoscopes?

Or take chemistry. Our philosopher of the thirteenth century shall be,
if you please, an universal genius, chemist as well as astronomer.
He has perhaps got so far as to know, that if he mixes charcoal and
saltpetre in certain proportions and then applies fire, there will be
an explosion which will shatter all his retorts and aludels; and he is
proud of knowing what will in a later age be familiar to all the idle
boys in the kingdom. But there are departments of science in which he
need not fear the rivalry of Black, or Lavoisier, or Cavendish, or Davy.
He is in hot pursuit of the philosopher's stone, of the stone that is
to bestow wealth, and health, and longevity. He has a long array of
strangely shaped vessels, filled with red oil and white oil, constantly
boiling. The moment of projection is at hand; and soon all his kettles
and gridirons will be turned into pure gold. Poor Professor Faraday can
do nothing of the sort. I should deceive you if I held out to you the
smallest ho