Hairy cell leukemia (HCL) 1  Is a type of blood cancer that begins in the bone marrow. 2  Is a rare type of leukemia in adults.  Hairy cell leukemia gets its name from the short, thin projections that look like hair on its cells.
In 1799 Humphrey Davy discovered anesthetic properties of nitrous oxide (N20)---also known as laughing gas.. He had recently joined Thomas Beddoesâ Pneumatic Institution (established 1798) for treatment of disease by inhalation.
At the time of William Mortonâs ether demonstration, people had known about ether for more than 300 years. But for most of those 300 years no one had thought to use it as an anesthetic.t the time of William Mortonâs ether demonstration, people had known about ether for more than 300 years. But for most of those 300 years no one had thought to use it as an anesthetic.