"-Why are there eight? I want each of you to practise the transforming spell on one of them. The phial will need to be made within six hours of its first use and so once you have succeeded with the first crystal you will wait till December twenty third, just past six in the evening to begin transfiguring the second crystal. At exactly midnight you will place the leaf in your phial as we spoke about last time. You will add your hair at this time and leave it be. When you return from Christmas break Slughorn will escort you to the forbidden forest where he will show you where and how to collect the dew." She peered around at them all, each of their expressions showing a different emotion.