different between photogene vs photogen

English

photogene (plural photogenes)

(obsolete) A photograph.
(archaic) An afterimage.
- 1864-1898, Herbert Spencer, Principles of Biology
  In youth , the visual apparatus is so quickly restored to its state of integrity , that many of these photogenes, as they are called , cannot be perceived .

photo- +? gene

photogene (plural photogenes)

photo- +? -gen

photogen (plural photogens)

(chemistry) A light hydrocarbon oil resembling kerosene, used as a lubricant, illuminant, etc.
(biology) A microorganism that produces phosphorescence.

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