The rules regarding an Alchemist's bombs states:
On a direct hit, an alchemist's bomb inflicts 1d6 points of fire damage + additional damage equal to the alchemist's Intelligence modifier. The damage of an alchemist's bomb increases by 1d6 points at every odd-numbered alchemist level (this bonus damage is not multiplied on a critical hit or by using feats such as Vital Strike). Splash damage from an alchemist bomb is always equal to the bomb's minimum damage (so if the bomb would deal 2d6+4 points of fire damage on a direct hit, its splash damage would be 6 points of fire damage).
Now this means a 1st level Alchemist with an Int of 16 will do 1d6+3 damage. If he rolls a 2 for damage, he will do 5 points damage, with 4 points splash damage. On a crit, he will double his damage to 10 points, but nowhere can I find anything about critical damage from the splash effect. Usually splash weapons do not deal critical damage. Does this mean the bomb only deals its critical damage on a direct hit, and never on its splash damage?