Abstract
First the article of H. Staudinger, H. Krassig and G. Welzel on “The Constitution of Urea-and ThioureaFormaldehyde Condensates (1956)” is introduced, dividing it into two chapters, i. e. thiourea condensates in chapter 1 and urea condensates in chapter 2. Next the article of H. Staudinger and G. Niessen on “The Condensation of Disubstituted Thiourea and Formaldehyde (1955)” is abstracted in chapter 3. Lastly in chapter 4 the some articles quoted in the above articles such as “Tannin (1913)” by E. Fischer, “Triazone (1947)” by J. Burke, “Condensation of Urea and Chloral (1910)” by G. S. Coppin and A. W. Titherley, and “Methylolurea (1933) by H. Kadowaki are shortly abstracted.
