THROUGH COOK'S STRAIT. 293

an influence on the water — then we have our highest or spring tides —
the lowest be-
ing called neap-
tides, when sun
and moon do
not pull togeth-
er. This is all
based on the
principle that
one mass of
matter will at-
tract another.
The tides are
an illustration
of the connec-
tion between
studies of the
sea and astron-

‘“SHCIL AHL SNOISVOOO LVHM

omy.’ Cook
studied the sub-
ject of the hea-
venly bodies.
He made such
able  observa-
tions on an
eclipse of the .
sun that he be-

 

came a marked
man. He also published a number of very valuable charts.
“Boys may think of Capt. Cook as only a kind of rough-and-ready