1XDEX. 267 



Cohesion : reciprocal attractions between solids and liquids, i. 25 



instance of the power of the cohesive force, i. 91 

 Colchicum, or meadow saffron, mode of reproduction of, i. 388 



poisonous alkaloid obtained from, i. 427 

 Collemacei, structure and habitat of, i. 307 

 Colloid bodies, i. 109, 110 



less diffusible than crystalloids, i. 109 



permeable to solutions of crystalloids, but impermeable to solutions 

 of colloids, i. 110 



characteristics of colloids, i. 1 1 1 

 Collomia grandiflora, fructification of, i. 380 

 Colocasia, water secreted by, i. 430 

 Colour, causes of, in flowers, green leaves, dyed cloth, gold, and copper, 



i. 35, 36 



Colouring matter of flowers and plants, i. 428, 429 

 Coniatula, structure of, ii. 175, 176 

 Combination, chemical, i. 94 



the law of definite proportions, i. 94, 95 



force of, i. 97, 98 



Combustion, effect of, in the consumption of coal in the steam-engine, 

 i. 29, 30 



combustion a case of impetus, i. 30 

 Comets, spectra of, i. 159 note, 163 

 Conferva glomerata, development of, i. 207 

 Confervaceae, habitat of, i. 206, 207 



structure and development of, i. 207 



reproduction of, i. 208 



modes of action of the vital forces of, i. 210 

 Confervse, cells and development of, i. 171 



Confervse, marine, structure, habitat, and reproduction of, i. 221, 222. 

 Conidium, or spore-dust cell, of fungi, i. 279 

 Coniomycetes, characters of the family of, i. 275 

 Conjugate, structure of the genus, i. 216 

 Conjugation, propagation of diatoms by, i. 200, 204 

 Constantinea rosa marina, i. 235 

 Constantinea sitchensis, i. 235 

 Copepoda, characters of the, ii. 204 

 Copper, properties of, i. 4 



colour of, in reflected and absorbed light, i. 35, 36 



its power of transmitting electricity, i. 90 



atomic weight of, compared with that of hydrogen, i. 100 



spectra of copper and its compounds, i. 145, 146 



