INDEX. 



299 



Padamis or screw pine, roots and habitat of, i. 387 

 Padina Pavonia, or Peacock's tail laver, structure of, i. 247 

 Pagurus, or hermit crab, structure and mode of reproduction of, ii. 197 

 Palm, stem or axis of a, i. 384 



growth and reproduction of palms, i. 384, 385 

 Palmoglcea macrococca, structure and development of, i. 182 

 Palmyra palm, growth of the stem of, i. 385 

 Papillaris, siliceous skeleton of, ii. 60 

 Paraffin, i. 105 



crystals of, how produced, i. 127 

 Paraffin oil and candles, i. 119, 127 

 Paramcecium caudatum, cilia and mouth of, ii. 68, 69 



immense propagation of, ii. 74 



Parkeriaceae, or Ceratopteridinese, structure and habitat of, i. 363 

 Parmelia saxatilis, structure and habitat of, i. 305 

 Parmeliacei, structure of the, i. 302 



characters of the group, i. 304 



Parmelia parcolerina, yellow dye obtained from the, i. 124 

 Parmelia parietina, dye obtained from, i. 303 

 Passalus cornutus, parasitic fungus in the stomach of, i. 274 

 Patchouli, amount of radiant heat absorbed by the perfume of, i. 44 

 Patellidse, or limpets, structure, food, and habitat of, 238, 239 

 Paulia perforata, organs of reproduction of, i. 301 

 Pea mildew, fungus producing the, i. 295 

 Peach, cause of blistered leaves of the, i. 291 

 Pear, cause of blistered leaves of the, i. 291 

 Pearl oyster, nacreous lining of shell of, ii. 234 

 Pease, caserne obtained from, i. 125 

 Peat, and peat mosses, i. 333 

 Pecten, or scallop, eyes of the, ii. 235 

 Pediastrum, structure and development of, i. 194 

 Pedicellaria globosa, structure of, ii. 180 

 Pelagia, structure and mode of reproduction of, ii. 97 

 Peltigeri, characters of the group, i. 305 

 Peneroplis, structure of, ii. 31, 32 

 Penicillia mould, structure of the, i. 285 

 Penicillium armeniacum, spores of, i. 285, 286 

 Penicillium candidum, production of, i. 287 

 Penicillium glaucum, structure and habitat of, i. 286, 287 



