Misc: With what is rainfall measured?

Questions

Who wrote The Swiss Family Robinson?

The female side of a family tree is known as the distaff side. What is the male side called?

Which middle eastern country's official name is Al-Lubnan?

What name is given to the socket in the skull which holds the eye?

New Zealand's National Day, the 6th February, is named after a Treaty of 1840. What is the day called?