@file_pinax -> documents -> @essay_on_menstruation:document {title: "An Essay on Menstruation", creator: @engle, institution: @drexel_university, created: @date_1849_02_25, language: "en", subjects: [@menstruation, @homeopathic_medicine, @female_physiology, @medical_theses]}

@engle:person {full_name: "Nathan S. Engle", affiliation: @homeopathic_medical_college_of_pennsylvania, nationality: @united_states}

@drexel_university:organization {location: @pennsylvania, country: @united_states}

@homeopathic_medical_college_of_pennsylvania:organization {type: "Medical College", location: @pennsylvania, field: @homeopathic_medicine}

@menstruation:concept {description: "Physiological discharge of blood from the uterus in females"} 
@catamenia:concept {synonym: "menstruation", related_to: @menstruation}
@homeopathic_medicine:concept {description: "System of alternative medicine based on the principle of “like cures like”"}
@female_physiology:concept {description: "Biological functions and processes specific to the female body"}
@medical_theses:concept {description: "Scholarly works submitted for a medical degree"}

@pennsylvania:place {country: @united_states}
@new_jersey:place {country: @united_states}
@england:place {country: @united_kingdom}
@scotland:place {country: @united_kingdom}
@greece:place {country: @greece}   // @greece is a common‑knowledge place, referenced only

@hippocrates:person {full_name: "Hippocrates", era: @date_0460_01_01}   // approximate era for context

@menstrual_cycle:concept {average_length_days: 28, typical_duration_days: 5}

@essay_on_menstruation -> discusses -> @menstruation
@essay_on_menstruation -> discusses -> @homeopathic_medicine
@essay_on_menstruation -> mentions -> @catamenia
@essay_on_menstruation -> describes -> @menstrual_cycle

@menstruation -> typical_blood_loss -> "4-6 ounces" {region: @united_states}
@menstruation -> typical_blood_loss -> "18 ounces" {region: @greece, source: @hippocrates}
@menstruation -> cycle -> @menstrual_cycle
@menstruation -> onset_age_range -> {min: 11, max: 19, typical: 15, region: [@england, @scotland]}

@file_hu_theses_1849engle_001_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_002_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_003_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_004_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_005_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_006_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_007_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_008_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_009_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_010_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_011_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_012_jpg -> part_of -> @essay_on_menstruation
@file_hu_theses_1849engle_013_jpg -> part_of -> @essay_on_menstruation

@file_hu_theses_1849engle_008_jpg -> contains_text -> "The ordinary time of duration of a single catamenial period is about five days; ..."
@file_hu_theses_1849engle_009_jpg -> contains_text -> "In our country the amount lost at each menstruation is from four to six ounces."
@file_hu_theses_1849engle_013_jpg -> contains_text -> "The only explanation I can give of the function of menstruation is that the uterine system becomes, at stated periods, the seat of a certain aphrodisiac excitement..."
@file_hu_theses_1849engle_007_jpg -> contains_text -> "The period of life at which the catamenia first make their appearance is not the same in all countries. In England and Scotland the greatest number of females begin to menstruate at 15 years of age..."
@file_hu_theses_1849engle_010_jpg -> contains_text -> "The function of menstruation usually ceases between the forty‑fifth and fiftieth year..."
@file_hu_theses_1849engle_011_jpg -> contains_text -> "The menstrual fluid proceeds from the uterus, which has been proved 1st by dissections of the uterus of females dying during the menstrual period..."
@file_hu_theses_1849engle_004_jpg -> contains_text -> "The menstrual process is physiological in its character, and consists in a sanguineous discharge from the uterine system..."
@file_hu_theses_1849engle_005_jpg -> contains_text -> "It is well known, that if the ovaries be congenitally defective, none of the signs of puberty to which I have alluded, will make their appearance..."
@file_hu_theses_1849engle_006_jpg -> contains_text -> "The catamenia often make their appearance without any premonitory symptoms; they are however preceded most usually by colicky pains..."
@file_hu_theses_1849engle_012_jpg -> contains_text -> "The cause of this periodical discharge is involved in great doubt. Lunar influence has been thought to be the cause..."
@file_hu_theses_1849engle_001_jpg -> contains_text -> "An Essay on Menstruation ... Respectfully submitted ... On the 25th day of Feb'y one thousand eight hundred and forty nine ..."
@file_hu_theses_1849engle_002_jpg -> contains_text -> "An Essay on Menstruation ... Respectfully submitted to the Homeopathic Medical College of Pennsylvania ... On the 18th day of Feb'y one thousand eight hundred and forty nine ..."