18 



EVERYDAY SCIENCE 



References are to pages 



Planets Continued 



sizes of 11, 13, 19 



solar system 10-19 



surfaces of 11 



temperatures of . . . . 11, 19 



visibility of 13 



Plants . . . 98-100, 166, 279, 284, 



366-399, 419, 421-422, 424, 



425-427, 431, 435-441, 445-447, 



522-541 



bacteria . . 398-399,422,435 

 cambium layer .... 374, 377 



capillary action 372 



carnivorous plants . . . 380-381 



cells of 371 



chlorophyll in 397 



circulation of sap in ... 382 

 classes of : 



by distribution : 



of land 284, 535-536, 540-541 



of sea . . . . 166, 531-532 



dependents. . . 397-399,422 



green-leaved plants . . 397-399 



diastase 383 



energy of 399 



factors in surface changes . 279 

 food, as 373, 399, 419, 425-427, 431 



fossils of '. . 522 



growth of 372 



molds . 399, 422 



osmosis in 372 



physical conditions vs. . 522-541 



propagation of . . 377, 392-393, 



398-399 



protoplasm in 371 



self -protecting plants . . . 381 

 structure of : 



flowers .... 387-392,422 

 leaves . 366,379-386,421-422 

 roots . . . 366-373, 421-422 

 seeds . . . 389, 392-396, 422 

 stems . 366,373-379,421-422 

 yeasts . . 303, 399, 422, 436-437 



Plasma 411 



Plateaus 268-273,276 



dissected 270-271 



old ........ 272-273 



young 268-269 



Pneumonia (bacterial disease) . 442 



Polar winds 220 



Polaris ; see North Star 

 Poles : 



of earth 8-9, 26 



of magnets 476 



Pollen 388 



Pollen basket (of bees) ... 404 



Polyp, coral 533 



Potash (fertilizer) 317 



Potassium (fertilizer) . . . . 316 

 Potassium (necessary for soil) 



311,345 



Potential energy 396 



Power (generated by combus- 

 tion, running water, wind) 472-473 

 Prairies (of U. S.) 274, 285, 301-302 

 Pressure . . . 123-126, 146-147, 

 154-155, 210-211, 502-503 



boiling-point vs 125 



condensation of steam vs. . 126 



effects of 502-503 



laws of 123 



of air . . . . . 123, 210-211 

 of water . . 146-147, 154-155 



transmission of 147 



within earth 502-503 



Prism (separator of colors of 



spectrum) 356-359 



Promontories 160 



Proteins : 



composition of . . 383, 425, 427 

 food properties of .... 428 

 amount necessary in diet . 428 

 found in eggs, fish, milk, 



meat, etc 427 



origin of ....... 425, 



required for growth and re- 

 pair of body-tissues . . . 428 

 Protoplasm (life-principle) 383-384, 

 400, 419, 425, 428-430 



composition of 428 



developed in green plant 

 leaves . 38-384, 400, 419, 425 

 428, 430 



Protozoa (invertebrates) 400-401, 

 452-455 



a cause of disease . 401, 452-457 



analogy to bacteria .... 401 



Ptomaines (caused by fungi) . 439 



