what are two incidents Cassius tells to Brutus?

Cassius recalls a windy day when he and Caesar stood on the banks of the Tiber River, and Caesar dared him to swim to a distant point. They raced through the water, but Caesar became weak and asked Cassius to save him. Cassius had to drag him from the water. Cassius also recounts an episode when Caesar had a fever in Spain and experienced a seizure. Cassius marvels to think that a man with such a feeble constitution should now stand at the head of the civilized world.