EXPLANATORY NOTES. 11 



little above or a little below accuracy. 100°+, would mean a little more than 

 100°, and 100° — , a little less, "d.," or "p.d.," affixed to a boiling point deter- 

 mination, indicates that the substance in question is either decomposed, or 

 •partly decomposed in boiling. 



In the column of Melting Points, the letters "a.," "d.," and "p.d.," and the 

 plus and minus signs, are used precisely as with the Boiling Points. The 

 letter "s.," however, shows that the temperature attached is that at which the 

 body named solidifies, "rs." stands for resolidifieation. Thus, "82.° rs. 78° " 

 would show that a body melted at 82°, and resolidified at 78.° 



In the lists of Authorities a variety of abbreviations are used, to point out 

 the whereabouts of the original paper, or the source from which a determina- 

 tion was obtained. References to "Dana's Mineralogy," "Watts' Dictionary," 

 "Strecker's Lehrbuch," "Kekule's Lehrbuch," and "Weltzien's Systematische 

 Zusammenstellung der Organischen Verbindungen," will of course be readily 

 recognized. But most of the abbreviations require detailed explanation. 



A single number appended to the name of an authority, refers to the list of 

 papers accompanying the tables. Thus, " Kopp. 18," would refer to Kopp's 

 paper numbered 18 in the list; or "Filhol. 12," to Filhol's paper numbered 12. 



Two numbers affixed to a name, refer to the "Jahresbericht," volume and 

 page. Thus, "Kenngott. 6. 853," refers to vol. 6, p. 853 of the above-named 

 work; or "Luca. 13. 98," to vol. 13, p. 98. 



The following abbreviations refer to various periodicals, — the series, (when 

 necessary), volume, and page, being always given. If the number for the 

 series be omitted, the first series is understood to be the one referred to. The 

 page is sometimes that at which a paper begins, and sometimes merely that 

 upon which a given determination is to be found. 



Ann. Phil. "Annals of Philosophy." 



A. C. P. "Annalen der Chemie und Pharmacie." 



A. C. Phys. "Annales de Chimie et de Physique." 



B. S. C. "Bulletin de la Societe Chimique." 

 Chem. N., or Chem. News. "Chemical News." 

 Chem. Gaz. "Chemical Gazette." 



C. R. " Comptes Rendus." 



C. S. J., or J. C. S. "Journal of the Chemical Society." 

 C. S. Mem. "Chemical Society's Memoirs." 



