This section is from the "Nature Cure: Philosophy and Practice Based on the Unity of Disease and Cure" book, by Henry Lindlahr.
If we apply the Laws of Periodicity to the course of acute febrile or inflammatory diseases, we find that the sixth day from the beginning of the first well-defined symptom marks the first Friday-period or the first crisis of the disease, and that every seventh day thereafter is also distinguished by aggravations and changes, either for better or for worse.
 
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