/ \ DEX 





Spiral arrangement of scales 



on cones 379 



Spiral bands of chlorophyll 



in spirogyra 310 



Spirillum, a form of bacterium 343 

 Spirogyra, example of algae 7. 



conjugating (fig.) 340 



described 339 



microphotograph of (fig.) . . 341 

 Spirog-yra and pleurococcus, 



summary of 342 



Sponges, bath (fig.) .... 58 



classified 6 



clog water mains (>1 



described .".7 



economic importance of . . . r,i 



example of Porifera .... »i 



how gathered 61 



how prepared 61 



number of 6 



parts of (fig.) 59 



relation to other animals . . til 



reproduction <K> 



structure of 58 



summary of 62 



two stages in development of 



(fig.) 60 



use of bacteria in preparation of .'^.". 



where obtained <>1 



Spongilla, reproduction of . . 60 



Spongy layer of leaf .... 27:; 



tissue of velamens 399 



Spleen, of frog 117 



Splints, used in Betting bones 186 



Spoiling of food by bacteria . 347 



Sporangia, of pteris (fig.) . . .".71 



Sporangium, of club moss (fig.) 373 



Spores (tig.) 360 



of bread mold 357 



of (dub moss ( fig. ) 373 



of corn smut (fig.) 362 



of moss 364 



Sporophyte, dependence of . . 366 



generation of moss 366 



Sprain, defined 186 



Spraying solution, ingredients 



of 25 



outfit (fig.) 21 



Sprouting of grain to furnish 



malt 355 



an to i ""/>'* 



Spruce, compared with pine 

 • cample ol l:> mnosperm 

 t iii'- source "i vrood pulp 

 wood of (fig.) 



Sputum, destructi 1 m 



<\\ 



Bpread of t uberculo« 



Squarr -I'msof mint family 



Squash, a dicotyledon . . . 



example ol j »* - j *• • 



d (fig.) 



Squid, described 



example of ( lepbalopoda 



of niullnsk 



Squirrel, agents in plant dis- 

 persal 



flying (fig.) 



gray (fig.) 



Stagnant pool, breeding place 



for mosquitoes 



Stalk of grain of corn . . . 

 Stamen, diagram of . . . . 

 Stamens and pistils of | 



(fig.) 



Staminate cones of pine . . 



Staminate flower 



of monoecious plants .... 



Ol willow ( tiu r - ) 



Staminate strobili. ol pirn 77 

 Starch, a nutrient 



chemical composition of ■ 



form of carbohydrate .... 



in fermentation . . . 



in floor 



product "f photosj ni bests 

 Starfish, anatomj ol (fig. I 



body "t". diagram .... 



classified 



described (fig.) • • 



familj 



group 



internal struct are of 

 life bistorj of ... 



looomol ion of . . . . 

 •-n miliary of ... 



State governments, pi 



tion ni fires bj 

 Statistics of life Insurance 



companies . . 

 Steam, a form of water 



i 



311 





152 

 151 



11 



1 

 17'' 



71 



71 

 71 







