210 INDEX. 



PAGE 



Pontia brassica, . . . . . ...* .116 



Podura plumbea, . . . . >. '..*: H6 



Proximate principles, . . . . . 130 



Primary form of organic matter, . . < $'4 ' 130 



Pus in urine, ..... ..- 170,181 



distinction between it and mucus, . . . 139 



Polarization of light, . . .' . > 188 



Q. 



Qualifications of a microscopist, . . . .;*' 18 



R. 



Religious sentiment, microscope conducive to, . . . 13 



Reflecting microscope superseded, .... 39 



a curious form of, . . . .39 



Rules for microscopic observations, ... 51 



Raphides, . . ; ' ''' . .76 



Retina of the eye, ...... 101 



Respiratory system of insects, ..... 123 



S. 



Simple microscopes, construction of, . ? :-.j, . .,-. 23 



magnifying powers of, . . 23 



mode of mounting, . . > - 23 



form of, for opaque objects, . ..26 



Stanhope lens, . . . . .'*. 29 



Silver cup or Lieberkuhn, . . ..... '. 37,46 



Side reflector, . . . . . 37, 46 



Stage micrometer, ...... 48 



Size of glass for mounting, . ^ . . . 55 



Sealing-wax varnish, . \ . . ' * * . 60 



Sand, ...... . 68 



Sections of granite, &c., . . . . . 68 



coal, . . . , . '. . 68 



wood, . .' . . . ' r . 72 



Siliceous cuticles, .... . - . 73 



