II. The same liquid, at the same temperature, has the same volume, or occupies the same space. It is on this law that our thermometers are constructed.
These two laws are known and established beyond doubt, if anything is known or established beyond doubt in physical science. Let us consider them in reference to the substance which is seen to liquefy in the vial or ampulla in the reliquary.
I. This substance has no fixed melting-point. Looking at Fergola’s table, we see that it liquefied one day at 67° in 15 minutes, while the day before, at 80°, it liquefied only in 33 minutes. One day at 76° it liquefied perfectly in 2 minutes, and the next day at 77° it occupied 41 minutes. It has liquefied in the month of January, during a procession in the public street, while it was borne aloft on a stand, and freely exposed to the general temperature—then probably between 50° and 60°, if not lower. At other times, in midsummer, with a temperature over 80°, it has remained solid and unliquefied for hours and for days. Nay, after having become liquid, it frequently solidifies again, just at the hours between 12 M. to 3 P.M., when the heat of the day reaches its maximum. It is clear that this liquefaction completely sets aside the first-mentioned law of the melting-point.
II. The law of volume is set aside with equal peremptoriness. As you look at the liquid in the vial, you see that it changes in volume, either increasing or decreasing. Sometimes the liquid occupies only about three-fourths of the space within the vial. Before
your eyes, it will increase, sometimes with froth, sometimes even bubbling more or less violently, sometimes retaining a perfectly tranquil and level surface; sometimes rising very slowly, sometimes rapidly; and it may continue to rise until it fills the vial. Or again, if the vial be full, or nearly full, the liquid within it will sink, either suddenly or gradually, hour by hour, with or without froth or bubbling, until it occupies perhaps three-fourths of the space. These changes take place in summer and in winter indifferently. They are entirely independent of the temperature. They evidently set aside the second law we have recited regarding volume.
III. A third law of nature is, that her steps are forward and not backward. A movement once made is never revoked. Chemical changes are progressive, and, so long as the ingredients and agents remain the same, they never go back to repeat a combination which has once been made and then changed for another.
Yet continual repetitions of the same forms, combinations, or conditions of the substance within the ampulla are a special characteristic of the liquefactions.
We will produce, hereafter, in a fitting place, evidence that for centuries the ampulla has not been opened, and consequently that its contents have not been changed. Nevertheless, the alternate hardenings and liquefactions, the variations of color, the frothing, and the ebullitions, and the increases and decreases of volume, have continued to succeed each other, and to be repeated hundreds, some of them thousands, of times.
Nay, leaving aside for the moment these longer periods, and confining our examination to the ten or twelve hours of a single day, during which
the ampulla is all the while under the public gaze, and any interference of chemical art with the contents is absolutely impossible, we still find these repetitions of the same form or combination. The blood was solid when first taken out, it liquefied, stood liquid for an hour or two, solidified again, and again liquefied. Perhaps it solidified a third time, and a third time liquefied. It commenced to froth, and it ceased, then commenced again, and again ceased. It changed color, and again returned to the prestine tint. It changed in bulk, either increasing or decreasing, and again returned to its former level.