Although their shapes are very different from the characters of today, being less uniform in shape and more picture-like, oracle bone characters were already fully developed, with semantic-phonetic compounds as well as the simple pictographs and ideographs. Therefore, there must have been precursors to oracle bone characters, which represented the first attempts at Chinese writing.
Oracle bones inscriptions were
discovered only a little more than 100 years ago. In 1899, these bones
surfaced in the
Before the oracle bone inscriptions were discovered, the oldest writing for a long time was the bronze inscriptions, which were discovered almost two thousand years ago at the height of the Han dynasty, from which the Chinese ethnicity and Chinese characters got their names (汉人 and 汉字)respectively。 Bronze inscriptions 金文 jinwen ‘metal writing’ are characters imprinted on bronze vessels used for ceremonial purposes. They are about 1000 years younger than oracle bone inscriptions,being from Zhou dynasty about three thousand years ago. Seal characters followed (so-called because of its use on seals) in the Qin dynasty (221-206 BC). There are two styles 大篆dazhuan ‘greater seals’ and 小篆xiaozhuan ‘lesser seals’.
Another major stage in the evolution of the Chinese writing is the appearance of隶书lishu ‘clerkly style’ in the Qin dynasty(221-206 BC). The style got its name from the official scribes that adopted this style of writing. Due perhaps to the change of the writing instrument, this style is more stylized, more uniform in shape and also closer to the present form. A major historical figure connected to this stage of the evolution of Chinese writing is the first emperor 秦始皇Qinshihuang, who, in his efforts to unify the country, ordered the standardization of Chinese characters, as well as weight and measure.
The most important study of Chinese characters 说文解字Shuowenjiezi ‘exegesis of characters’ was written in the Eastern Han dynasty by许慎Xu Shen(58-147 AD). 说文解字was the first work to systematically analyze and categorize Chinese characters. The categories Xu proposed are still valid today. Xu thus was the first to recognize such characters as pictographs, simple and compound indicative characters and semantic phonetic compounds, as well as of the equivalent of the Rebus Principle.
There is a wealth of websites with excellent pictures and discussion of oracle bone and bronze inscriptions, as well as the evolution of Chinese writing. I include some of them here for your reference.
Websites on Oracle Bones Inscriptions
In English:
http://www.ancientscripts.com/chinese.html
http://www.logoi.com/notes/chinese_origins.html
In Chinese (but the pictures are worth looking at even if you can’t read Chinese):
http://www.chinavista.com/experience/oracle/oracle.html
http://www.paulnoll.com/China/Culture/language-oracle-bone.html
http://www.cc5000.com/zhishi/shufa/jiaguwen1.htm
Chinese Websites on Bronze Inscriptions (for the pictures, if you can’t read Chinese):
http://homepage2.nifty.com/tagi/koten011.htm
http://www.npm.gov.tw/exhbition/wen0630/c.htm
http://www.shanghaimuseum.net/library/asp/lbs_show.asp?ssflid=4&lbdhid=28