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"Bang, bang."

At the sound of knocking, Joseph, who had already changed into his pajamas, frowned slightly. Then he heard a girl's voice. "Your Highness, there is something I would like to ask you."

It was Perna's voice. As for Eman and Kexer, the moment she had appeared at the cabin stairway, they had already tactfully "vanished."

Joseph looked down at his pajamas, casually picked up the jacket of his cavalry uniform and draped it over himself, then said toward the door, "Please come in."

Strictly speaking, he was dressed in a rather improper manner, but this was not Versailles Palace, so there were not so many rigid requirements.

The door opened, and Perna, dressed in a neat white uniform, walked in with her head lowered. She quickly curtsied, then stammered somewhat, "Your, Your Highness, um, I wanted to learn a little about, that is..."

She straightened her waist, and her voice grew a little louder. "The method you used to treat Camellia yesterday—oh, it was called 'cardiopulmonary resuscitation' and 'artificial respiration,' wasn't it?"

Joseph nodded. "Yes. They are actually both part of the Cardiopulmonary Resuscitation Technique. Besides being used to save drowning victims, it can also deal with situations such as cardiac arrest and shock.

"Its main principle is to..."

Perna suddenly said, "Your Highness, could you teach me the Cardiopulmonary Resuscitation Technique? I mean, as a doctor, I hope I can..."

"Of course." Joseph nodded. He had taught Perna no small amount of medicine before, so he immediately raised his hands and began gesturing. "Well, you must first remember the formula for cardiopulmonary resuscitation, which is '120 plus 30 plus 2.'

"What this means is, when performing chest compressions, you do 120 per minute, and you must use force. After 30 compressions, you perform two rounds of artificial