But in the course of their great experiment they had together made rules by which they had mutually agreed to be bound. They had of late determined that the old man must not be disturbed in his profound rest by any question tending to cause a state of mental activity. The test of a very fine instrument had proved that the shortest interval of positive lucidity was followed by a slight but distinctly perceptible rise of temperature in the body, and this could mean only a waste of the precious tissues they were so carefully preserving. They hoped and believed that the grand crisis was at hand, and that, if the body did not now lose strength and vitality for a considerable time, both would slowly though surely increase, in consequence of the means they were using to instill new blood into the system. But the period was supreme, and to interfere in any way with the progress of the experiment was to run a risk of which the whole extent could only be realised by Unorna and her companion. She hesitated therefore, well knowing that her ally would oppose her intention with all his might, and dreading his anger, bold as she was, almost as much as she feared the danger to the old man’s life. On the other hand, she had a motive which the physician could not have, and which, as she was aware, he would have despised and condemned. She had a question to ask, which she considered of vital importance to herself, to which she firmly believed that the true answer would be given, and which, in her womanly impetuosity and impatience, she could not bear to leave unasked until the morrow, much less until months should have passed away. Two very powerful incentives were at work, two of the very strongest which have influence with mankind, love and a superstitious belief in an especial destiny of happiness, at the present moment on the very verge of realisation.