**Extraction from the two files**  

@file_pinax -> has title -> "Richard Gardiner Thesis Collection on Obstetrical Forceps"  
@file_pinax -> has creator -> @gardiner  
@file_pinax -> has institution -> @drexel_university  
@file_pinax -> created on -> @date_1850  
@file_pinax -> language -> "en"  
@file_pinax -> has subject -> [  
    "Obstetrics",  
    "Forceps",  
    "Midwifery",  
    "Medical Instruments",  
    "Childbirth",  
    "Medical History",  
    "Medical Science",  
    "Homoeopathic Medicine",  
    "Theses",  
    "Historical Documents",  
    "Images"  
]  
@file_pinax -> description -> "A collection of materials related to Richard Gardiner's thesis on the use and history of obstetrical forceps, including text documents and digitized images. The collection discusses the advantages, timing, and potential dangers of using forceps in childbirth, as well as the historical context of medical science and homoeopathic medicine."  
@file_pinax -> source -> "PINAX"  
@file_pinax -> place -> [@united_states, @philadelphia_pa]  

@file_thumbs_db -> asset type -> "Image/Asset with OCR (no OCR available)"  
@file_thumbs_db -> related to -> @gardiner_thesis_collection:document  

---

**Synthesis across subdirectories**

# Collection‑level abstraction
@gardiner_thesis_collection:document {  
    title: "Richard Gardiner Thesis Collection on Obstetrical Forceps",  
    creator: @gardiner,  
    institution: @drexel_university,  
    created: @date_1850,  
    language: "en",  
    subjects: [  
        "Obstetrics", "Forceps", "Midwifery", "Medical Instruments", "Childbirth",  
        "Medical History", "Medical Science", "Homoeopathic Medicine", "Theses",  
        "Historical Documents", "Images"  
    ],  
    description: "Comprehensive set of texts, images, and metadata documenting Gardiner’s 1850 thesis on obstetrical forceps, its historical background, and related medical discourse."  
}

# Linking the metadata file to the collection
@file_pinax -> documents -> @gardiner_thesis_collection  

# The collection aggregates the three major content groups already defined
@gardiner_thesis_collection -> includes -> @obstetrical_forceps_discussion:event  
@gardiner_thesis_collection -> includes -> @essay_obstetrical_forceps:document  
@gardiner_thesis_collection -> includes -> @gardiner_thesis_images:document  

# Connecting the creator across all components
@gardiner -> authored -> @obstetrical_forceps_discussion:event  
@gardner -> authored -> @essay_obstetrical_forceps:document  
@gardner -> created -> @gardiner_thesis_images  

# Institutional and geographic context
@gardner -> affiliated with -> @drexel_university  
@drexel_university -> located in -> @philadelphia_pa  
@philadelphia_pa -> part of -> @pennsylvania  
@pennsylvania -> part of -> @united_states  

# Subject‑level thematic links (showing recurring themes)
@obstetrical_forceps_discussion:event -> discusses -> @obstetrical_forceps:instrument  
@essay_obstetrical_forceps -> about -> @obstetrical_forceps:instrument  
@gardiner_thesis_images -> depicts -> @obstetrical_forceps:instrument  

# Instrumental delivery concept ties
@instrumental_delivery:concept -> related to -> @obstetrical_forceps:instrument  
@midwifery:concept -> related to -> @obstetrical_forceps_discussion:event  

# Cross‑file asset linkage
@file_thumbs_db -> part of -> @gardner_thesis_collection  

---  

**Summary of synthesis**

- The **Gardiner Thesis Collection** (`@gardiner_thesis_collection`) is the unifying entity that brings together the discussion event, the essay document, and the TIFF image set.
- **Richard Gardiner** (`@gardner`) is the common author/creator across all three content types and is linked to the institution **Drexel University** and its location in **Philadelphia, Pennsylvania, United States**.
- The central **instrument** (`@obstetrical_forceps:instrument`) is the thematic anchor, appearing in the discussion, the essay, and the image collection, illustrating a consistent focus on obstetrical forceps across textual and visual materials.
- The metadata file (`@file_pinax`) serves as the descriptive record for the entire collection, while the `Thumbs.db` asset (`@file_thumbs_db`) is a peripheral image‑related file tied to the same collection.