De Camp and Ley have claimed ( in their Lands Beyond ) that Leonhard Euler also proposed a hollow-Earth idea, getting rid of multiple shells and postulating an interior sun across to provide light to advanced inner-Earth civilization but they provide no references ; indeed, Euler did not propose a hollow-Earth, but there is a slightly related thought experiment.

De Camp and Ley also claim that Sir John Leslie expanded on Euler's idea, suggesting two central suns named Pluto and Proserpine ( this was unrelated to the dwarf planet Pluto, which was discovered and named some time later ).

In particular, De Camp argued the plots of the novels are heavily driven by coincidence ; while many things just happened in the romances, the novels are still weakened by the dependence on it.

De Camp was born in New York City, one of three sons of Lyon de Camp and Emma Beatrice Sprague.

De Camp once noted that he rarely used pen-names, " partly because my own true name sounds more like a pseudonym than most pseudonyms do.

An aeronautical engineer by profession, De Camp conducted his undergraduate studies at the California Institute of Technology ( where his roommate was at one point noted rocket fuel scientist John D. Clark ), and earned his Bachelor of Science degree from Caltech in Aeronautical Engineering 1930.

De Camp was also a surveyor and an expert in patents.

De Camp was a member of the all-male literary and dining club the " Trap Door Spiders " in New York City, which served as the basis of Asimov's fictional group of mystery solvers the " Black Widowers ".

De Camp himself was the model for the character named " Geoffrey Avalon ".

De Camp was also a member of the Swordsmen and Sorcerers ' Guild of America ( SAGA ), a loosely-knit group of Heroic fantasy writers that was founded during the 1960s.

De Camp was a materialist who wrote works examining society, history, technology and myth.

De Camp had the mind of an educator, and a common theme in many of his works is a corrective impulse regarding similar previous works by other authors.

De Camp wrote a number of lesser-known but nonetheless significant works that explored such topics as racism, which he considered to be more accurately described as ethnocentrism.

De Camp was best known for his light fantasy, particularly the " Harold Shea " series and " Gavagan's Bar " series, both written in collaboration with his longtime friend Fletcher Pratt.

De Camp also produced a few more of this genre on his own.

De Camp wrote three sword and sorcery sequences of note.

De Camp also wrote historical fiction, set in the era of classical antiquity from the height of the Persian Empire to the waning of the Hellenistic period, which forms a loosely-connected series based on their common setting and occasional cross references.

De Camp enjoyed debunking doubtful history and pseudoscientific claims of the supernatural, and explaining how ancient civilizations produced structures and architecture thought by some to be beyond the technologies of their time, such as the Pyramids of Ancient Egypt.

De Camp was guest of honor at the 1966 World Science Fiction Convention.

De la Union sent Montforte with 2, 800 infantry and 800 cavalry to reinforce the Camp of Trompettes and Del Puerto with 2, 000 more to help Venegas.

De La Soul have influenced numerous other hip hop artists such as Camp Lo, The Black Eyed Peas, and Digable Planets.

Upon the urging and encouragement of the activist Cardinal Archbishop of Manila Jaime Sin, millions of Filipinos trooped to Camp Aguinaldo along Epifanio De los Santos Avenue ( EDSA ), where Enrile and Ramos have been holding operations, to give their moral support and prayers for the reformist soldiers.

In comedy he was ably supported by his wife, Marie Therese De Camp, whom he married on 2 July 1806.

De Vries ' loyalty to his master is unusual in that he continues to serve the Baron with great enthusiasm even though his Mentat abilities and great intelligence confirm his suspicions that his master plans to eventually kill him.

* Possible date-Nicolaus Copernicus begins to write Commentariolus, an abstract of what will eventually become his heliocentric astronomy De revolutionibus orbium coelestium ; he sends it to other scientists interested in the matter by 1514.

Rossellini and De Marchis separated in 1950 ( and eventually divorced ).

( Newton had also communicated ' De motu ...' to Flamsteed, and during the period of composition he exchanged a few letters with Flamsteed about observational data on the planets, eventually acknowledging Flamsteed's contributions in the published version of the ' Principia ' of 1687.

It is not known just why Newton changed his mind so radically about the final form of what had been a readable narrative in ' De motu corporum, Liber secundus ' of 1685, but he largely started afresh in a new, tighter, and less accessible mathematical style, eventually to produce Book 3 of the ' Principia ' as we know it.

Widely exhibited in Europe, the Arts and Crafts style's simplicity inspired designers like Henry van de Velde and styles such as Art Nouveau, the Dutch De Stijl group, Vienna Secession, and eventually the Bauhaus style.

The position was eventually filled on his recommendation by Gonzalo " Gonz " Martinez De La Cotera, a friend whose previous band Lincoln had opened for Marcy Playground.

From 1959 to 1960 series Loopy De Loop and The Flintstones, softly orchestrated themes, some of them almost sounding concrete music and some played only by accordion, were used in other H-B cartons between 1961 and 1963 – like Top Cat, Snagglepuss, Touché Turtle, Wally Gator and the Yogi Bear and Huckleberry Hound 1961 seasons and all of its segments – and eventually between 1964 and 1967, and rarely then until the eighties.

But De Witt's success would eventually produce his downfall and nearly that of the Republic with it.

Among the most notorious Keepers in the Middle Ages were the 14th-century gaolers Edmund Lorimer, who was infamous for charging inmates four times the legal limit for the removal of irons, and Hugh De Croydon, who was eventually convicted of blackmailing prisoners in his care.

In the fourth round Trinidad pressured the offense while De la Hoya tried to avoid his punches by moving, both boxers eventually exchanged punches.

De Jong, who was at the time not even a member of the party, eventually agreed to the position and became a member of the Catholic People's Party that year.

He discovers that De Marchand is about marry a wealthy riverman and a love triangle ensues, with Breen eventually winning out.

When De Soto crossed the Mississippi River in 1539, he traveled to a point below the mouth of the St. Francis River and eventually passed through present-day Butler County.

Nabisco eventually purchased the De Leon Peanut Company.

The film, Raging Bull, was initially only a minor box office success, but eventually became a huge critical success both for director Martin Scorsese and actor Robert De Niro, who gained about 60 pounds during the shooting of the film to play the older LaMotta in later scenes.

* Edna Babish De Fazio ( Betty Garrett )— The landlady who eventually marries Laverne's father, Edna occasionally sings and dances in the local brewery talent shows.

During her childhood, Rose moved with her family several times, living with relatives in Minnesota and then Florida, briefly returning to De Smet, South Dakota, before the family finally settled in Mansfield, Missouri, in 1894, where her parents eventually established a dairy and fruit farm.

De La Beckwith was eventually convicted at a subsequent trial three decades later, a case chronicled in the movie Ghosts of Mississippi.

This campaign, which eventually took De la Gardie and his troops all the way to Moscow, is known as the De la Gardie Campaign.

As De la Gardie supported many of Oxenstierna's other policies, eventually the two leaders reconciled after Oxenstierna's return to Sweden in 1636.

A number of plans were eventually drawn up by Morgan and his cadre of staff officers for the invasion of Normandy, finally deciding that the invasion should take place on a thirty-mile front west of the River Orne, rejecting the need to capture the Pas De Calais and the ports there by calling for the creation of prefabricated artificial ports to ferry equipment and troops ashore once the initial landings had occurred.

The house passed through generations of the De Scaccario family ( spelt in many different forms ) until it seems to have passed into the D ' Awtrey family, whose name was eventually anglicised to Hawtrey.