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In controlled exposure studies , volunteer subjects are exposed to one or more pollutants through a mouthpiece ( oral breathing only ) or in a chamber ( oronasal breathing ) . Further , the enemy would naturally on his arrival at once burn and ruin the country at the time when the spirits of the people are still hot and ready for the defence ; and , therefore , so much the less ought the prince to hesitate ; because after a time , when spirits have cooled , the damage is already done , the ills are incurred , and there is no longer any remedy ; and therefore they are so much the more ready to unite with their prince , he appearing to be under obligations to them now that their houses have been burnt and their possessions ruined in his defence . I was a movie freak . One morning he assembled the people and senate of Syracuse , as if he had to discuss with them things relating to the Republic , and at a given signal the soldiers killed all the senators and the richest of the people ; these dead , he seized and held the princedom of that city without any civil commotion .