The sixteenth subject is this, that, when a woman becomes pregnant in a house, it is necessary to make an endeavor so that there may be a continual fire in that house, and to maintain a good watch over it. 2. And, when the child becomes separate from the mother, it is necessary to burn a lamp for three nights and days -- if they burn a fire it would be better -- so that the demons and fiends may not be able to do any damage and harm.