both the telescope and the microscope.

The wonder-man of Alkmaar, Cornelius Drebbel, who performed such
astounding feats for the amusement of Rudolph of Germany and James of
Britain, is also supposed to have invented the thermometer and the
barometer. But this claim has been disputed. The inventions of Jansens
are proved.

Willebrod Snellius, mathematical professor of Leyden, introduced the true
method of measuring the degrees of longitude and latitude, and Huygens,
who had seen his manuscripts, asserted that Snellius had invented, before
Descartes, the doctrine of refraction.

But it was especially to that noble band of heroes and martyrs, the great
navigators and geographical discoverers of the republic, that science is
above all indebted.

Nothing is more sublime in human story than the endurance and audacity
with which those pioneers of the sixteenth and seventeenth centuries
confronted the nameless horrors of either pole, in the interests of
commerce, and for the direct purpose of enlarging the bounds of the human
intellect.

The achievements, the sufferings, and the triumphs of Barendz and Cordes,
Heemskerk, Van der Hagen, and many others, have been slightly indicated
in these pages. The contributions to botany, mineralogy, geometry,
geography, and zoology, of Linschoten, Plancius, Wagenaar, and Houtmann,
and so many other explorers of pole and tropic, can hardly be overrated.

The Netherlanders had wrung their original fatherland out of the grasp of