Early in the twentieth century psychologist Carl Jung developed some concepts concerning astrology, which led to the development of psychological astrology.

Early in the twentieth century, several chemists tried to make ammonia from atmospheric nitrogen.

Early in the twentieth century, libertarian socialism was as powerful a force as social democracy and communism.

* Early nineteenth century – beginning twentieth century: Unrequited love as a form of mental disease

* Early twentieth century – present: Delusional belief of " being loved by someone else "

Early in the twentieth century, it was leased by the New York Central System.

Early in the twentieth century, it had large powder plants and manufacturers of radio tubes, incandescent lamps, paving brick, flour, iron, lumber, sole leather, etc.

Early in the twentieth century, there were silk mills, foundries, a candy factory, a fabricating plant, and a cigar factory.

Early in the twentieth century, four large gas compressing stations and a shovel factory were located in Waynesburg.

Early in the twentieth century, it had extensive stove and brass factories, glass and bottle works, embroidery and silk mills, a dye and bleaching plant, bridge works, and manufactories of bricks, gas meters, stockings, shirts, shafting parts, wagons, agricultural implements, etc.

Early in the twentieth century, anthracite coal mining was the chief industry of the region, although Frackville remained a predominantly residential community.

Early in the twentieth century, Wellsboro was the shipping point and trade center for a large area.

Early in the twentieth century the port of Liepāja became a central point of embarkation for immigrants traveling to the United States.

Early twentieth century scientists theorised ways of getting around the limitations of the relatively large wavelength of visible light ( wavelengths of 400 – 700 nanometers ) by using electrons.

Early twentieth century chair made in eastern Australia, with strong heraldic embellishment

Early Bowden cable, from the 1890s and first years of the twentieth century, is characterised by the outer tube being wound from round wire and being uncovered.

Early in the twentieth century, German silver was used by automobile manufacturers before the advent of steel sheet metal ; for example, the famous Rolls-Royce Silver Ghost of 1907.

Early in the twentieth century, the county council of Dumbarton adopted the form " Dunbartonshire " in preference to " Dumbartonshire " and this became the accepted official form.

Early twentieth century pedestrian bridge in central São Paulo.

" Early modernist poets mocked it and, in the twentieth century, the poem lost both esteem and popularity.

Early in the twentieth century, a selective breeding program was established to develop the best qualities of these cats.

Early in the twentieth century, a group of Dresden artists adapted the Printmaking techniques for Woodcut prints to linoleum, thus creating the Linocut printmaking technique.

Early twentieth century teething ring and pacifier.

Early twentieth century technical books on modern surveying and geodesy include Roy's work as the historical starting point for the modern profession.

Early in the present century, W. H. Stevenson continued the attack with a savage article against Guest.

Early in the nineteenth century the State of New Hampshire was casting about for a way to found its own state university.

Early 19th century.

The current consensus, based on terminology defined by the Pecos Classification, suggests their emergence around the 12th century BCE, during the archaeologically designated Early Basketmaker II Era.

Early plate in Italy, and elsewhere in the 13th – 15th century were made of iron.

File: KofunCuirass. jpg | Early Japanese armour, iron helmet and cuirass with gilt bronze decoration, Kofun period, 5th century.

File: Qian_Xuan_-_Early_Autumn. jpg | Early Autumn, Qian Xuan, 13th century, depiction of decaying lotus leaves and dragonflies hovering over stagnant water

), Early 13th century.

The basis of western astronomy as taught during Late Antiquity and until the Early Modern period is the Almagest by Ptolemy, written in the 2nd century.

Early in the 19th century, Baguirmi fell into decay and was threatened militarily by the nearby kingdom of Ouaddai.

Early in the 17th century, groups in the region rallied to Abd al-Karim, who overthrew the ruling Tunjur group, transforming Ouaddai in an Islamic sultanate.

Early nineteenth century rendition of Capricornus as a sea-goat.

Early 20th century American preacher Billy Sunday epitomizes the Evangelical focus on " going to heaven " in his sermon “ Heaven: A Wonderful Place ; Where There is No More Death ; Blessed Hope of the Christian .” In the message Sunday characteristically explained the feelings of his audience by saying “ Everybody wants to go to Heaven.

Early speculations into the nature of the chemical bond, from as early as the 12th century, supposed that certain types of chemical species were joined by a type of chemical affinity.

The significant Late Neolithic and Early Bronze Age Cycladic culture is best known for its schematic flat idols carved out of the islands ' pure white marble centuries before the great Middle Bronze Age (" Minoan ") culture arose in Crete, to the south: these figures have been looted from burials to satisfy a thriving Cycladic antiquities market since the early 20th century.

Early in the 20th century, Columbus also was home to a number of pioneering car manufacturers, including Reeves, which produced the unusual four-axle Octoauto and the twin rear axle Sextoauto, both around 1911.

Crannogs were used as dwellings over five millennia from the European Neolithic Period, to as late as the 17th / early 18th century although in Scotland, convincing evidence for Early and Middle Bronze Age or Norse Period use is not currently present in the archaeological record.

Although recognized previously by others, the mathematical expression for the Coriolis force appeared in an 1835 paper by French scientist Gaspard-Gustave Coriolis, in connection with the theory of water wheels, Early in the 20th century, the term Coriolis force began to be used in connection with meteorology.

Early in the 20th century, the notion that belief had to be justified as such to count as knowledge lost favour.

Early in the 11th century Sigmund or Sigmundur Brestisson, whose family had flourished in the southern islands but had been almost exterminated by invaders from the northern, was sent from Norway, whither he had escaped, to take possession of the islands for Olaf Tryggvason, king of Norway.

Indeed, at the end of the 19th century scholar Ernest DeWitt Burton wrote that there could be " no reasonable doubt " that 1 John and the gospel were written by the same author, and Amos Wilder has said that, " Early Christian tradition and the great majority of modern scholars have agreed on the common authorship of these writings, even where the author has not been identified with the apostle John.

* 17th century – Early Quakers, such as Edward Burrough, make mention of tongues speaking in their meetings: " We spoke with new tongues, as the Lord gave us utterance, and His Spirit led us ".

The Old High German period is reckoned to run until about the mid-11th century, though the boundary to Early Middle High German ( second half of the 11th century ) is not clear-cut.