Mathew Carey Lea
Encyclopedia
Mathew Carey Lea was Philadelphia
Philadelphia, Pennsylvania
Philadelphia is the largest city in the Commonwealth of Pennsylvania and the county seat of Philadelphia County, with which it is coterminous. The city is located in the Northeastern United States along the Delaware and Schuylkill rivers. It is the fifth-most-populous city in the United States,...

-born American
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 chemist
Chemistry
Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry is concerned with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds....

.

He was the son of the naturalist and publisher Isaac Lea
Isaac Lea
Isaac Lea was an American conchologist, geologist, and businessman, who was born in Wilmington, Delaware.-Life:...

 and the brother of the Henry Charles Lea
Henry Charles Lea
Henry Charles Lea was an American historian, civic reformer, and political activist. Lea was born and lived in Philadelphia.-Parents:...

, a historian.

He devoted himself chiefly to the chemistry of photography
Photography
Photography is the art, science and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor or chemically by means of a light-sensitive material such as photographic film...

, to which he made a number of important contributions. His publications include numerous papers on the chemical action of light
Photosynthesis
Photosynthesis is a chemical process that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight. Photosynthesis occurs in plants, algae, and many species of bacteria, but not in archaea. Photosynthetic organisms are called photoautotrophs, since they can...

and an excellent Manual of Photography (second edition revised and enlarged, 1871). He is also known for his development of Carey Lea Silver, a photochemical, still in use today.

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