Principle: Nothing is an offence merely by reason of its being done v. with the knowledge that it is likely to cause harm, if it be done without any criminal intention to cause harm, and in good faith for the purpose of preventing or avoiding other harm to a person or property.

Facts: Mr. Sharman, the Captain of a steam vessel, suddenly and without any fault or negligence on his part, finds himself in such a position that, before he can stop his vessel, he must inevitably run down a boat B, with twenty or thirty passengers on board, unless he changes the course of his vessel, and that, by changing his course, he must incur the risk of running down a boat C with only two passengers on board and which he may possibly clear.