26 
INDEX 
References are to pages 
Oysters, artificial raising of . . 193 
destroyed by starfish . 173, 193 
examples of mollusks . . . 185 
study of, by Bureau of Fish¬ 
eries .526 
P 
Palate of man.406 
Palisade cells of leaf .... 285 
Palmately compound leaves 277 
Palps of clam.188 
Panama Canal, a health prob¬ 
lem .494 
Pancreas of man.409 
Pancreatic juice, enzymes in 412 
Paper, made from wood pulp of 
spruce trees.346 
Papilionaceous flowers . . . 299 
Papillae of tongue.404 
Pappus, use of ... . 239, 241 
Paraffin, in transpiration ex¬ 
periment .284 
Parallel venation.276 
of leaves of lily family . . . 297 
of grass leaves.295 
Paramecium ..146 
example of protozoa . . . 149 
mode of defense.147 
study of.146 
Parasites, action of .... 
176-178, 320, 488, 493 
group of fungi.320 
ichneumones.41 
liver fluke.175, 176 
plants, modifications of . . 366 
tapeworms.495 
Thalessa.51 
Parasitic fig wasp.243 
. Parasitism, a dependent rela¬ 
tion .57 
Parsley family, characteristics 
of.300 
list of plants in.300 
Parsnips, member of parsley 
family.300 
storage of food in ... 252 
Partridge, wings of .... 108 
Parts of a flower found in nas¬ 
turtium .198 
Parts of a leaf.276 
Parts of a lily.200 
Parts of nervous system in 
man.466 
Passer domesticus, scientific 
name of English sparrow . 10 
Pasteur, discoverer of lactic 
acid bacteria.316 
study of bacteria by . . . 316 
Pasteurization, defined . . . 314 
Pasteurized milk.314 
Pasteur solution, formula of 322 
Patent medicines, defined 501, 506 
to be avoided in consumption 492 
Patrolling of forests .... 360 
Peaches, produced by rose 
family.298 
Peach-tree borer.39 
Peanut, peculiar habit of . 299 
Pea plant, modified leaves of . 290 
member of bean family . . 299 
Peanut shucks as adulterant 428 
Pears, example of pome . . 234 
Peat.340 
Pectoral girdle of vertebrates . 69 
Peculiarities of plant life . . 366 
Peculiar uses of leaves . . . 289 
Pedal ganglion of clam . . . 188 
Peg of hypocotyl.220 
Pelvic girdle of vertebrates . . 70 
Pelvis, of kidney . . . . . 458 
of trunk of man.458 
Penguins, use of wings . . . 107 
Pennyroyal, a medicine . . . 300 
Peony. 252, 297 
Pepo.237 
Peppermint.300 
Pepsin, an enzyme.14 
Peptone in agar-agar formula 312 
Perch, a bony fish.71 
classified. 9 
Perennial roots.252 
Perfect flower, definition of 199 
Perianth of lily family . . . 297 
Periblem.247 
Pericardium, of clam .... 187 
of man. 452 
Pericarp.233 
Permanent residents . . . ill 
Permanent teeth.407 
Perspiration, discussed . . . 459 
Petals, described.198 
