Melon Seeds

Melon seeds will grow Melons in 1.8.

Over time, Melon Seeds will grow into the maximum size and grow a Melon on any adjacent Farmland block. If one of the adjacent Farmland blocks has a Melon on it, the seed will not grow any more Melons until the Melon is removed. A single seed can grow an infinite amount of Melons.

Melon seeds can be found in Abandoned Mine Shaft Chests or crafted from a single melon slice.

Melon seeds could not be grown using bonemeal in the first 1.8 pre-release. However in the second pre-release as well as the final version, they can.

Melon seeds take a longer time to grow than other crops, and breaking a melon block yields 3-7 melon slices.

Destroying a fully grown melon will yield two melon seeds

Crafting
Melon seeds can be crafted out of 1 Melon (Slice).