320 INDEX. 



Woodsiese, or Peranemese, characters of the group, i. 350 



"Worms, or annulosa, characters of, ii. 144 



Wormskioldia sanguinea, structure and habitat of, i. 239, 240 



Wormwood, absorption of radiant heat by the perfume of, i. 44 



"Wrangelia pencillata, spores of, i. 237 



Wrangeliacese, structure and mode of reproduction of, i. 237 



X 



Xenodochus parodoxus, spores of, i. 276 



Y 



Yeast plant, i. 286, 288 



yeast of beer, i. 287, 288 



German yeast, i. 288 

 Yellow dye, obtained from aniline, i. 124 

 Yttrium, i. 4 



Z 



Zinc, i. 4. 



spectrum of volatilized zine, i. 64 



atomic weight of, compared with that of hydrogen, i. 100 



peroxide of, combination forming, i. 104 



seleniate of, different forms assumed by, according to the tempera- 

 ture of the -water united with, i. 107, 108 

 Zirconium, i. 4 

 Zonaria, structure of, i. 247 

 Zooids of Hydrozoa, ii. 88-90 

 Zoophytes, characters of, ii. 81 



hydrozoa, ii. 81, 86 



actinozoa, ii. 130 



anthozoa, ii. 119 



alcyon, ii. 119 



Zoospores of Confervacese, i. 208 

 Zostera marina, or sea wrack, crimson fringe of the, i. 231 



characters of the flowers of, i. 387 

 Zygnema quininum, mode of reproduction of, i. 217 

 Zygodesmus fuscus, spores of, i. 286 



THE END. 



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