Why are those glasses in the punch bowl?
That is actually a terrific type of object called a monteith. It was used for rinsing and chilling wine glasses between courses. The earliest known use of the monteith was in England in the 17th century. The first examples were made from silver, but soon ceramic and porcelain versions were made.
What was this used for?
This is called a "monteith," and it was used to wash wine glasses between courses. In the 18th century, glass was too expensive for most households to have different glasses for each kind of wine, so this would be used this to rinse the same glass between courses. A monteith could also act as bottle cooler, or as a punch bowl!
The earliest known use of the monteith was in England in the 17th century. The first were made from silver, but soon ceramic and porcelain versions were made.