Arthur Hill Hassall
Encyclopedia
Arthur Hill Hassall was a British physician, chemist and microscopist
Microscopy
Microscopy is the technical field of using microscopes to view samples and objects that cannot be seen with the unaided eye...

 who is primarily known for his work in public health
Public health
Public health is "the science and art of preventing disease, prolonging life and promoting health through the organized efforts and informed choices of society, organizations, public and private, communities and individuals" . It is concerned with threats to health based on population health...

 and food safety
Food safety
Food safety is a scientific discipline describing handling, preparation, and storage of food in ways that prevent foodborne illness. This includes a number of routines that should be followed to avoid potentially severe health hazards....

.

He entered medicine through apprenticeship in 1834 to his uncle Sir James Murray, spending his early career in Dublin, where he also studied botany and the seashore. In 1846 he published a two-volume study, The Microscopic Anatomy of the Human Body in Health and Disease, the first English textbook on the subject.

After further studying botany
Botany
Botany, plant science, or plant biology is a branch of biology that involves the scientific study of plant life. Traditionally, botany also included the study of fungi, algae and viruses...

 at Kew
Royal Botanic Gardens, Kew
The Royal Botanic Gardens, Kew, usually referred to as Kew Gardens, is 121 hectares of gardens and botanical glasshouses between Richmond and Kew in southwest London, England. "The Royal Botanic Gardens, Kew" and the brand name "Kew" are also used as umbrella terms for the institution that runs...

 and publishing on botanical topics, particularly freshwater algae, he came to public attention with his 1850 book A microscopical examination of the water supplied to the inhabitants of London and the suburban districts, which became an influential work in promoting the cause of water reform. In the early 1850s he also studied food adulteration
Adulterant
An adulterant is a chemical substance which should not be contained within other substances for legal or other reasons. Adulterants may be intentionally added to more expensive substances to increase visible quantities and reduce manufacturing costs or for some other deceptive or malicious purpose...

; his reports were published in The Lancet
The Lancet
The Lancet is a weekly peer-reviewed general medical journal. It is one of the world's best known, oldest, and most respected general medical journals...

 by reformer Thomas Wakley
Thomas Wakley
Thomas Wakley , was an English surgeon. He became a demagogue and social reformer who campaigned against incompetence, privilege and nepotism. He was the founding editor of The Lancet, and a radical Member of Parliament .- Life :Thomas Wakley was born in Membury, Devon to a prosperous farmer and...

 and led directly to the 1860 Food Adulteration Act and subsequent further legislation against the practice.

He also worked as physician at the Royal Free Hospital
Royal Free Hospital
The Royal Free Hospital is a major teaching hospital in Hampstead, London, England and part of the Royal Free Hampstead NHS Trust....

, but required long breaks through ill-health due to pulmonary tuberculosis
Tuberculosis
Tuberculosis, MTB, or TB is a common, and in many cases lethal, infectious disease caused by various strains of mycobacteria, usually Mycobacterium tuberculosis. Tuberculosis usually attacks the lungs but can also affect other parts of the body...

, and in 1869 moved to the Isle of Wight
Isle of Wight
The Isle of Wight is a county and the largest island of England, located in the English Channel, on average about 2–4 miles off the south coast of the county of Hampshire, separated from the mainland by a strait called the Solent...

. On the basis of his experience of the microclimate
Microclimate
A microclimate is a local atmospheric zone where the climate differs from the surrounding area. The term may refer to areas as small as a few square feet or as large as many square miles...

 of the Undercliff, he established the National Cottage Hospital for Consumption and Diseases of the Chest (later Royal National Hospital for Diseases of the Chest), a sanatorium
Sanatorium
A sanatorium is a medical facility for long-term illness, most typically associated with treatment of tuberculosis before antibiotics...

 at Ventnor
Ventnor
Ventnor is a seaside resort and civil parish established in the Victorian era on the south coast of the Isle of Wight, England. It lies underneath St Boniface Down , and is built on steep slopes and cliffs leading down to the sea...

, Isle of Wight
Isle of Wight
The Isle of Wight is a county and the largest island of England, located in the English Channel, on average about 2–4 miles off the south coast of the county of Hampshire, separated from the mainland by a strait called the Solent...

.

From 1878 onward, aiming to rest in warmer climates, he spent most of his time in Europe, gaining permission to practise both in San Remo
Sanremo
Sanremo or San Remo is a city with about 57,000 inhabitants on the Mediterranean coast of western Liguria in north-western Italy. Founded in Roman times, the city is best known as a tourist destination on the Italian Riviera. It hosts numerous cultural events, such as the Sanremo Music Festival...

, where he and his family lived, and Lucerne
Lucerne
Lucerne is a city in north-central Switzerland, in the German-speaking portion of that country. Lucerne is the capital of the Canton of Lucerne and the capital of the district of the same name. With a population of about 76,200 people, Lucerne is the most populous city in Central Switzerland, and...

, where he worked in the summer. During this time he wrote extensively on climatic treatments for tuberculosis, works such as the 1879 San Remo and the Western Riviera Climatically and Medically Considered. His autobiography, The narrative of a busy life, was published in 1893.

Two medical terms are named after Hassall: Hassall's corpuscles
Hassall's corpuscles
Hassall's corpuscles are structures found in the medulla of the human thymus, formed from eosinophilic dead type VI epithelial reticular cells arranged concentrically...

, which are spherical bodies in the medulla of the thymus gland, and Hassall-Henle bodies
Hassall-Henle bodies
Hassall-Henle bodies are small transparent growths on the posterior surface of Descemet's membrane at the periphery of the cornea. These bodies contain collagenous matter in which numerous cracks and fissures are filled with extrusions of the corneal endothelium...

, which are abnormal growths in the Descemet membrane of the eye.

His Ventnor hospital operated until 1964 when it closed, made obsolete by drug treatment of tuberculosis, to be demolished in 1969. Its grounds are now the site of Ventnor Botanic Garden
Ventnor Botanic Garden
Ventnor Botanic Garden is a botanic garden located in Ventnor, Isle of Wight. It was founded in 1970, by Sir Harold Hillier, and donated to the Isle of Wight Council. The garden is free to visit, except for parking charges....

.

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