AUTHOR'S PREFACE TO THE SIXTH RUSSIAN EDITION

	2nd Series, Typical elements	4th Series	6th Series	8th Series	10th Series	12th Series
V.		N 14	V 51	Nb 94	?Di 142	Ta 183	—
		vol. i. 223	vol. ii. 194	vol. ii. 197	vol. ii. 93	vol. ii. 197
VI.		O 16	Cr 52	Mo 96	—	W 184	U 239
		vol. i. 155	vol. ii. 276	vol. ii. 290		vol. ii. 290	vol. ii. 297
VII.		F 19	Mn 55	? 99	—	—	—
		vol. i. 489	vol. ii. 303
			Fe 56	Ru 102	—	Os 192
			vol. ii. 317	vol. ii. 369		vol. ii. 369
VIII.			Co 59	Rh 103	—	Ir 193
			vol. ii. 353	vol. ii. 369		vol. ii. 369
			Ni 59·5	Pd 106	—	Pt 196
			vol. ii. 353	vol. ii. 369		vol. ii. 369

		3rd Series	5th Series	7th Series	9th Series	11th Series
I.	H 1	Na 23	Cu 64	Ag 108	—	Au 197
	vol. i. 129	vol. i. 533	vol. ii. 398	vol. ii. 415		vol. ii. 442
II.		Mg 24	Zn 65	Cd 112	—	Hg 200
		vol. i. 590	vol. ii. 39	vol. ii. 47		vol. ii. 48
III.		Al 27	Ga 70	In 114	—	Tl 204
		vol. ii. 70	vol. ii. 90	vol. ii. 91		vol. ii. 91
IV.		Si 28	Ge 72	Sn 119	—	Pb 207
		vol. ii. 99	vol. ii. 124	vol. ii. 125		vol. ii. 134
V.		P 31	As 75	Sb 120	—	Bi 209
		vol. ii. 149	vol. ii. 179	vol. ii. 186		vol. ii. 189
VI.		S 32	Se 79	Te 125	—	—
		vol. ii. 200	vol. ii. 270	vol. ii. 270
VII.		Cl 35·5	Br 80	I 127	—	—
		vol. i. 459	vol. i. 494	vol. i. 496