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  • Human saliva displaying ferning. During the fertile phase of a woman's menstrual cycle an oestrogen surge causes salt crystals to appear in the saliva. When viewed under the microscope the crystalline salt structure resembles fern leaves and can be used as an indication of a woman's increased chances of conceiving at this time.
  • Human saliva displaying ferning. During the fertile phase of a woman's menstrual cycle an oestrogen surge causes salt crystals to appear in the saliva. When viewed under the microscope the crystalline salt structure resembles fern leaves and can be used as an indication of a woman's increased chances of conceiving at this time.
  • Human saliva displaying ferning. During the fertile phase of a woman's menstrual cycle an oestrogen surge causes salt crystals to appear in the saliva. When viewed under the microscope the crystalline salt structure resembles fern leaves and can be used as an indication of a woman's increased chances of conceiving at this time.
  • Human embryo for IVF
  • Human embryo for IVF
  • Human embryo for IVF
  • Human embryo for IVF
  • An operation to collect eggs from a woman for in vitro fertilisation. Lithograph by Virginia Powell, 1997.
  • Human embryo from IVF
  • Human embryo grades
  • Embryo manipulation equipment
  • Embryo manipulation equipment
  • Embryo biopsy lab
  • Embryo biopsy lab
  • Embryo biopsy lab
  • Embryo biopsy lab
  • Human blastocyst hatching
  • Amyloid fibrils
  • Human sacrifice among the Khonds in India: a victim (meriah) about to be dismembered. Wood engraving by C. Krull after J. Fuchs, 186-.
  • Amuletic stone figurines to ensure fertility, Bolivia.
  • Amuletic stone figurines to ensure fertility, Bolivia.
  • Amuletic stone figurines to ensure fertility, Bolivia.
  • Amuletic stone figurines to ensure fertility, Bolivia.
  • Foochow, Fukien province, China: a woman carrying buckets of night-soil. Photograph by John Thomson, 1871.
  • Foochow, Fukien province, China: a woman carrying buckets of night-soil. Photograph, 1981, from a negative by John Thomson, 1869.
  • Foochow, Fukien province, China: a woman carrying buckets of night-soil. Photograph, 1981, from a negative by John Thomson, 1869.
  • Foochow, Fukien province, China: a woman carrying buckets of night-soil. Photograph by John Thomson, 1871.
  • Mouse blastocyst stage embryo
  • Min, Egyptian god of fertility, wall relief
  • Zebrafish embryo.