Xll TABLE OF CONTENTS 



II. The Production of Proteids in Plants 



PAGE 



18. The Nitrogenous Food of Lower Organisms 58 



19. Can Seedlings make use of the free Nitrogen of the Atmosphere for 



the Formation of Proteids ? 59 



20. Bacterium Badicicola and the Papilionacese 62 



21. The Detection of Ammonia and Nitric Acid in Water and in Plants. 



Nitromonas 68 



22. Nitric Acid as a Nutrient Substance 71 



23. Ammonia as Nutrient Material 71 



24. The Seat of Proteid Formation in the Higher Plants . . . .73 



25. The Decomposition of Nitrates in Plants 76 



III. The Constituents of the Ash of Plants 



26. Mechanical Analysis of Soil 77 



27. The Detection of certain Food Stuffs in the Soil 79 



28. Food Stuffs in Water 80 



29. Ash Analysis 80 



30. The Higher Plants need to be supplied with Mineral Substances. 



Sodium and Silicon are not essential 82 



31. Phosphorus, Sulphur, Potassium, Calcium, Magnesium, and Iron are 



necessary for the Higher Plants 84 



32. Requirements of Fungi 86 



33. The Forms in which certain Mineral Substances occur in Plants . . 87 



IV. Organic Compounds as Food for Plants 



34. Humus Mycorhiza 90 



35. Experiments with Penicillium Crustaceum 92 



36. Some other Saprophytes 94 



37. Saccharomyces Cerevisiss 95 



38. Bacteria ....'..- 97 



39. Some Parasitic Fungi 100 



40. Lichens 102 



41. Experiments with Carnivorous Plants 103 



SECOND SECTION 

 THE MOLECULAR FORCES IN PLANTS 



I. The most Important Organised Structures of Plant Cells 



42. The Membranes of Plant Cells . . 107 



