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| CHAP. I. | Concerning the root causes of the crisis, or the decretory Decretory days are the specific days of an illness when a "judgment" or decision of the body's fate occurs. days. | 36 |
| II. | The reason why the moon, by its arrival in the aforementioned places of the Zodiac, brings about so many alterations in the sick person or the disease, leading toward either recovery or death. | 39 |
| III. | In which the error of Hippocrates and Galen regarding the order and counting of critical days is clarified, as well as the reason for the error; similarly, the reason why the crisis sometimes occurs in fewer and sometimes in more days is treated in this place. | 41 |
| CHAP. I. | In which the use and practice of finding critical days and changes in diseases—both for good and for ill—by means of an eight-sided figure is explained. | 43 |
| II. | In which an even more exact method, according to the doctrine of Ptolemy and the Egyptian astrologers, for finding and discerning the decretory places and critical alterations by means of a 16-sided figure, is made known. | 45 |
| III. | Concerning the formula for crafting the critical mirror for the sick; it consists of four parts, and here first the reason for the composition of the critical rim itself and its division into critical places is explained. | ibid. |
| IV. | Concerning the heaven, or the lunar wheel, and its division into circles and spheres. Finally, concerning the division of the celestial signs into degrees, and the expression of the names, magnitudes, and natures of the more notable fixed stars upon it. | 47 |
| V. | Concerning the small wheel called the hourly wheel, and the method of its construction. | 53 |
| VI. | Concerning the preparation of the indicating ruler and the fiducial line. A fiducial line is a fixed reference line used as a basis for calculation or measurement on a scientific instrument. | ibid. |
| VII. | Concerning the use of the critical rim. | 55 |
| VIII. | Concerning the use and practice of the hourly wheel. | 57 |
| IX. | Concerning the demonstrative ruler or the fiducial Index. | 59 |
| CHAP. I. | In this chapter, the lunar degrees in the heavens on the critical mirror—namely, those in which the Moon original: "☾" was at the onset of the disease—are confirmed and adapted to the places on the critical rim; it is shown that judgment cannot be made without such adaptation. | 60 |
| II. | In this, certain specific rules or canons regarding the moon's motion and the various changes produced in critical places are expressed. | 61 |
| III. | In which the method for finding the day and the lunar degrees corresponding to the proposed motion of the moon is explained. | 62 |
| IV. | On the method for finding the true motion of the moon for the hour of the first onset of the disease, or when the patient took to bed. | 65 |
| V. | On several rules especially necessary for critical practice. | 66 |
| VI. | In which an example of practicing with this critical mirror is provided. | 69 |
tradition of the Pythagoreans than on solid reason.
| CHAP. I. | It is shown that all things consist of number, measure, and weight, and that times are ordered and distributed according to number into days and hours that are either upright and benevolent or unjust and cursed. | 72 |
| II. | How good days are distinguished from bad ones by observing the lunar number. | 74 |
| III. | On the dangerous days of any given moon, according to the opinions of both the ancient Pythagoreans and astrologers. | ibid. |
| IV. | Concerning solar numbering; that is, the calculation or selection of certain days, first from the solar year, then from the solar month, and finally from the week, in which danger threatens those who fall ill; the Author discusses the dangerous days of the year in this chapter. | 75 |
| V. | On the dangerous and unlucky days of the solar months, in which, if anyone begins to be sick, the disease will be either laborious or lethal for them. | ibid. |
| VI. | Differences in diseases derived from the properties of days and months. | 77 |
| VII. | On the fortunate and unfortunate days observed by astrologers to exist in any solar month, in which, consequently, effects—either lucky or unlucky—are observed to be produced in the sick as well as in other worldly affairs. | 80 |
| VIII. | How the days of the week cause changes for those who take to bed or begin to fall ill upon them. | 81 |
| IX. | How both lucky and unlucky hours, as well as happy and unhappy portions of the day, are assigned to each complexion. In historical medicine, 'complexion' refers to a person's temperament or balance of bodily humors. | 82 |
| X. | In which a certain meteorological numbering—first from the ordered natures of the 7 days of the week, and then from the days of the months—seems to predict future diseases. | ibid. |
| CHAP. I. | Where the hidden and secret mystery of Nomancy is treated. | 84 |
| II. | What Nomancy or Onomancy is; in this, the first species of the Pythagorean sphere is depicted. | 87 |
| III. | Where the use of that spherical instrument is treated. | 88 |
| IV. | The construction and use of another sphere is explained. | 89 |
| V. | How from the calculation of letters alone we can divine the primordial death of a husband and wife—that is, which of them will die first. | 91 |
| CHAP. I. | On the prognostic signs elicited from the observation of the winds, according to both sacred and Galenic doctrine. | 93 |
| II. | How meteors, or meteorological bodies created in the air from the blowing of the winds themselves, are signs predicting future diseases. | 95 |
| III. | In which [matters] composed of meteors, which [pertain] to putrefaction and corruption— |