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Of the following papers, those marked * were read. "8. L( The chlorine derivatives of pyridine. Part V. Constitution of citrazinic acid. Formation of aa'-dichloropyridine and of aa'-diiodoisonicotinic acid." By W. J. Sell, M.A., and F. W. Dootson, M.A. Although its genetic relationships leave little room for doubt that in citrazinic acid the hydroxyl groups occupy the aa'-positions relatively to the nitrogen, in view of the importance of this compound and its derivatives it was deemed expedientdoi:10.1039/pl9001600009 fatcat:53mymupza5c5jnh2wnbctmrt6m