INDEX. 277 



Fly fungus, i. 274 



Fontinalei, structure and habitat of, i. 331 

 Food, miraculous descent of, i. 305 

 lichens as, i. 305, 308 

 importance of, to the animal frame, ii. 3 

 Foot-pound, the, of Mr. Joule, i. 26 

 unit of mechanical force, i. 26 



Foraminifera, structure and geological importance of, ii. 27 

 various forms of, ii. 28 

 order of porcellanous foraminifera, ii. 30 

 order of arenaceous foraminifera, ii. 36 

 order of vitreous foraminifera, ii. 37 



abundance of fossil foraminifera in the sedimentary strata, ii. 52 

 mode of obtaining casts of, ii. 53 

 comparison of foraminifera recent and fossil, ii. 53 

 the Eozoon Canadense, ii. 54 



the Carpentaria a link between the foraminifera and sponges, ii. 57 

 Force, i. 23 



store of, eternal and unchangeable, i. 24, 25 

 cohesion, i. 25 



in solids, i. 25 

 in liquids, i. 25 



reciprocal attraction between solids and liquids, i. 25 

 unit of mechanical force, i. 26 

 heat generated by impetus, i. 27 

 unit, or mechanical equivalent of heat, i. 29 

 combustion a case of impetus, i. 30 

 energy existing in the coal fields on the globe, i. 30 

 magnetism and electricity, i. 30 

 influence offeree on the aggregation of matter, i. 73 

 power of electricity in this respect, i. 74 

 relations between the force of magnetism and atoms of matter 



i. 75 



effect of the physical forces on molecular arrangement, i. 91 

 electricity, i. 91 

 motion, i. 91 

 catalysis, i. 91 



force of chemical combination, i. 97, 98 



relation between chemical affinity and mechanical force, i, 98 

 Formic acid, synthetical formation of, i. 424 

 Fragillaria, development of, i. 201 

 Frauenhofer's lines, i. 129 



