INDEX. 1 79 



PAGE 



Ovis gl 



Oxyhaemoglobin, spectrum of 134 



Oxyphiles m 



Paper and paper making 95, 96 



" -fibres, analytical key 98 



" manufacture 96 



' ' , raw materials 96 



' ' stock, kinds and amounts 97 



Papyrus 95 



Paraffin imbedding 47 



Paranitrotoluol crystals , 148 



Parchment 95 



Pasteur 106 



Pearlyte in steel 165 



Pedesis 37 



Penetration 35 



Pepper, adulterants 78 



" , microscopic structure of 76 



Petrography 153 



Phloem (see Bast-fibre). 



Piper 7& 



Plano-convex lens (see Convex Lens). 



Plane polarized light 155 



Pleochroism 158 



Pliny 9 



Polariscope 155, 156 



" structure of 156 



Polarization with microscope 157 



Polarized light 155 



Polarizer 157 



Polarizing microscope > 157 



Poplar-fibres loi 



Pork, examination for Trichina (see Trichina). ■ 



Potassium iodide crystals 148 



Potato-starch 59, 61 



" , microscopy of 63 



Principal axis 6 



" focus 6 



Prisms, effect of angle 5 



' ' , refraction by 5 



