326 SOME RECENT RESEARCHES IN PLANT PHYSIOLOGY 



Magnesium carbonate, action on 

 peroxide, 226 



ribbon, use in reductions, 278 

 Mannitol, 58 



Medicago oxidase, 220, 250 

 Melanins, 218 



Mendelian segregation of content 

 of starch, etc., 16 



of pigments, 254, 269 

 Mitochondries, 286, 287 

 Moisture, determination of, 50 

 Molecular weight: 



of anthocyanin, 269 



of sap solutes, 10, 12, 18, 27, 



157 

 Myelin forms, 288 



Osmotic pressure : 



due to electrolytes of sap, 



155-163, 188-198 

 to non-electrolvtes of sap, 



155-169, 188-198, 214 

 effect upon growth, 182-185 

 laws of, 77-79 

 magnitude of, in algse, 177- 



180, 182 



in bacteria, 183 

 in fungi, 184 

 in plant organs: 

 in buds, 165 

 in fruits, 156-160 

 in leaves, 149-151, 



154-156, 163-170 

 in rhizomes, 160-164 

 in roots, 160-164, 



170 



in sap of transpira- 

 tion stream, 188- 

 208, 214 

 in secretions, 98 

 in stems, 152, 188- 



198 

 phanerogams of normal 



soil, 149-170 

 of deserts, 171-173 

 of salt lagoons, 176 

 of xerophytic asso- 

 ciations, 175, 177 

 in Torula, 175 

 in yeast, 86-94 



Osmotic pressure: 



measurement of 



by Barger's capillary tube 



method, 76 

 by Dixon's gas pressure 



method, 76 

 by elevation of boiling 



point, 75 

 by hydrostatic pressure, 



75,82 

 by lowering of freezing 



point, 76, 85 

 by plasmolysis, 94, 108 

 by vapour pressure deter- 

 minations, 75 



Parthenogenesis, artificial, 185 

 Pectin : 



coagulation of, by electrolytes, 



70-73 

 gelatinization of, by pectase, 



67, 73 



by alkalies, 74 

 properties of, 63-66 

 Pectose, 64 

 Permeability: 



alternations of, 131 



of animal membranes, 137-139- 



of artificial membranes, 82 



differential, 102-104 



of egg membranes, 138 



of protoplasm, alterations duo 



to acids, 130 

 to alkalies, 129 

 to anaesthetics, 116-119 

 to essential oils, 117, 173- 

 to hormones, 117 

 to light, 134, 185 

 to mechanical stimulus, 



95 

 to temperature, 118, 131- 



133 



to salts, 110-128, 131 

 of seed coats, 139-147 

 Plasmolysis, 75 



contraction of wall during, 



95 



false, 103-106 

 precautions for, 108 

 recovery from, 109 

 true, 103, 109 

 of yeast, 80-95 



