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The Story of Mankind [170]

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authorities, but he continued to use his telescope and

provided Isaac Newton with a mass of practical observations,

which greatly helped the English mathematician when he dis-

covered the existence of that interesting habit of falling objects

which came to be known as the Law of Gravitation.



That, for the moment at least, exhausted the interest in the

Heavens, and man began to study the earth. The invention

of a workable microscope, (a strange and clumsy little thing,)

by Anthony van Leeuwenhoek during the last half of the 17th

century, gave man a chance to study the ``microscopic'' creatures

who are responsible for so many of his ailments. It laid

the foundations of the science of ``bacteriology'' which in the

last forty years has delivered the world from a great number of

diseases by discovering the tiny organisms which cause the

complaint. It also allowed the geologists to make a more

careful study of different rocks and of the fossils (the petrified

prehistoric plants) which they found deep below the surface of

the earth. These investigations convinced them that the earth

must be a great deal older than was stated in the book of

Genesis and in the year 1830, Sir Charles Lyell published his

``Principles of Geology'' which denied the story of creation as

related in the Bible and gave a far more wonderful description

of slow growth and gradual development.



At the same time, the Marquis de Laplace was working on

a new theory of creation, which made the earth a little blotch

in the nebulous sea out of which the planetary system had

been formed and Bunsen and Kirchhoff, by the use of the

spectroscope, were investigating the chemical composition of the

stars and of our good neighbour, the sun, whose curious spots

had first been noticed by Galileo.



Meanwhile after a most bitter and relentless warfare with

the clerical authorities of Catholic and Protestant lands, the

anatomists and physiologists had at last obtained permission

to dissect bodies and to substitute a positive knowledge of our

organs and their habits for the guesswork of the mediaeval

quack.



Within a single generation (between 1810 and 1840) more

progress was made in every branch of science than in all the

hundreds of thousands of years that had passed since man first

looked at the stars and wondered why they were there. It

must have been a very sad age for the people who had been

educated under the old system. And we can understand their

feeling of hatred for such men as Lamarck and Darwin, who

did not exactly tell them that they were ``descended from

monkeys,'' (an accusation which our grandfathers seemed to

regard as a personal insult,) but who suggested that the proud

human race had evolved from a long series of ancestors who

could trace the family-tree back to the little jelly-fishes who

were the first inhabitants of our planet.



The dignified world of the well-to-do middle class, which

dominated the nineteenth century, was willing to make use

of the gas or the electric light, of all the many practical applications

of the great scientific discoveries, but the mere investigator,

the man of the ``scientific theory'' without whom no

progress would be possible, continued to be distrusted until

very recently. Then, at last, his services were recognised. Today

the rich people who in past ages donated their wealth for

the building of a cathedral, construct vast laboratories where

silent men do battle upon the hidden enemies of mankind and

often sacrifice their lives that coming generations may enjoy

greater happiness and health.



Indeed it has come to pass that many of the ills of this

world, which our ancestors regarded as inevitable ``acts of

God,'' have been exposed as manifestations of our own ignorance

and neglect. Every child nowadays knows that he can

keep from getting typhoid fever by a little care in the choice of

his drinking water. But it
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