972 
INDEX. 
Wood, Causes of Variation in Density of, 
812. 
• , Formation of Rods in Secondary, 
634. 
• , Spring and Autumn, 633. 
Wood-Mason, J., Results of Indian Deep 
Sea Dredging, 193, 361. 
Woods, Comparative Structure of, 812. 
Wool Plug, Cotton-, Glass Cover-tube as 
Substitute for, 151. 
Worms, Aquatic Oligochsetous, 789. 
, Earth-, and Tubercle Bacilli, 847. 
, Sensory, Epithelia of Annelid, 788. 
Woronin, — ., Fungus-vegetation on Snow, 
79. 
Wortmann, J., Nitrification, 236. 
Wright, H. G. A., 905. 
, J. C., 444, 446, 905. 
, L., Spherical Aberration — Apochro- 
matic Objectives, 552. 
Writing Ink for Glass or Porcelain, 552. 
Wurtz, R., Bacteriological Technique, 901. 
, Note on two Differential Characters 
of Eberth’s Bacillus and the Bacterium 
coli commune , 412. 
Wyssokowitch, — ., Influence of the quan- 
tity of Tubercle Bacilli injected on 
course of disease in rabbits and guinea- 
pigs, 406. 
X. 
Xenococcus , 403. 
Xerobdella Lecomtei, 790. 
Xylem, Secondary, of Apetalse, 500, 634. 
, Sieve-tubes in, 500. 
Y. 
Yatabc, R., New Prasiola , 77. 
Yeast, Cultivating Ascospores of, 525. 
, Hansen on Pasteur’s Pure, 243. 
, Red-coloured Must-fermenting, 83. 
, Sulphuretted-hydrogen-forming, 834. 
Yeasts of Natural and Artificial Wines, 
536. 
Yellow Fever, Microbe of, 535. 
Yolk-organ of Vertebrata, 456, 760. 
sac, Nutritive Importance, 344. 
Z. 
Zacharias, E., Cell-content of Phyco- 
chromacese, 86. 
Zacharias, E., Growth of Cell-wall of Root- 
hairs, 67. 
, Phenomena of Impregnation, 387. 
, Structure of Phycochromacese, 838. 
Zander, R., Present State of Doctrine of 
Cell-division, 461. 
“ Zanthoxylum Corky Excrescences on 
Stem of, 814. 
Zawada, K., Leaves of Palms, 386. 
Zebra, Parasites from Intestine of, 210. 
Zeiller, R., Fructification of Spheno- 
phyllum , 827. 
Zeiss’s New Microscope Objective, 107. 
Zelinka, C., Studies on Rotifers, 488. 
Zentmayer’s American Continental Micro- 
scope, 663. 
Dissecting Microscope, 415. 
Zettnow, E., Structure of Bacteria, 246. 
Ziegler, F., Surface Views of Frog 
Embryos, 587. 
H. E., Amitotic or Direct Nuclear 
Division, 18. 
Zimmermann, A., Botanical Microtech- 
nique, 555. 
, Microchemical Reactions of Cork 
and Cuticle, 903. 
Zoanthese, Methods of Examining, 437. 
of Torres Straits, 217. 
Zoia, R., Dendroclava Dohrni, 491. 
, Nervous System of Hydra, 623. 
Zollikofer, R., Capitate Hairs and Motile 
Filaments of Dipsacus, 819. 
Zoo’cecidia, 74. 
Zoochlorellse, 220. 
Zoogametes of Enteromorpha, 648. 
Zoological Affinities of Cyprsea, 195. 
Position of Solenoconcha, 465. 
Zoosporanges, Plurilocular, of Asperococcus 
and Myriotricliia, 76. 
Zopf, W., Laticiferous System of Papa- 
veracese, 383. 
, On the Physiology and Morphology 
of Lower Organisms, 654. 
, Root-brown of Lupins, 651. 
Zoth, O., Experiments on Diffracting 
Structure of Striated Muscle-fibre, 142. 
Zschokke, F., Fauna of Alpine Lakes, 
194. 
, Parasites of Trutta salar , 374. 
Zukal, H., Cell-contents of Schizophyta, 
655. 
Zykoff, W., Development of Gemmules in 
Ephydatia fluviattlis, 378, 624. 
ERRATA. 
Vol. 1891, Index: — 
Page 859, Charrin, Chemical Nature, &c .,for p. 649 read p. 647. 
„ 868, line 16 from bottom, for “ Cladasporieie ” read “ Cladosporiea?.” 
„ 882, line 22, for “ Cells ” read “ Callus.” 
Vol. 1892 : — 
Page 394, line 10 from bottom, for “ Angiosperms” read “ Gymnosperms.” 
LONDON: PRINTED BT WILLIAM CLOWE? AND SONS, LIMITED, STAMFORD STREET AND CHARING CROSS. 
