204 
Eggplant, 84. 
Elm, 84. 
seedlings of, 59. 
Epichle typhina, 47. 
Erysiphe polygoni, 99. 
Etiolation, 18. 
Experimental and Research Station, 
Cheshunt, 32. 
BHyre, 182. 
Ferns, 24. 
Flagella, 121. 
Flammarion, 20, 21. 
Flour paste, 183. 
Flowers of sulphur, 181. 
Formaldehyde, 60. 
Freiberg, 147. 
Fruit diseases, 88. 
Fuel bill, 24. 
Fungi: 
effect of high temperatures on, 36. 
effect of low temperatures on, 36. 
in nursery water supplies, 29. 
Fungicides, 177. 
Fungus spores : 
condition for germination of, 25. 
Fusarium lycopersici, 73, 84, 85, 192. 
spores of, 85. 
temperature relations of, 86. 
Fusarium root rot of the tomato, 68. 
Fusarium sp., 117. 
Fusarium vasinfectum var. niveum, 87. 
Fusarium wilt, 73. 
Fusarium wilt of cucumber and melon, 
86. 
Fusarium wilt of the tomato, 84. 
control of, 86. 
effect of lime on, 48. 
effect of temperature on, 37. 
temperature relations of, 86. 
Gas injury, 52, 53. 
Gilia tricolor, 59. 
Glass : 
blue, indigo and violet rays, 18. 
big overlaps, 19. 
importance of using white glass of 
consistent purity, 21. 
irregular surface flaws and bubbles, 
20. 
light transmitting properties of 
different kinds, 20. 
quality of, 19. 
relation between root development 
and colour of, 21. 
relation of colour of flowers to 
colour of, 21. 
relation of dry weight of plants to 
colour of, 20. 
relation of plant growth to colour 
of, 20. 
DISEASES OF GLASSHOUSE PLANTS 
Glass—contd. 
relation of temperature of house to 
colour of, 20. 
small panes, 19. 
size of, 18. 
white, red, green and blue, 20. 
Glasshouses : 
effect on crop management of large, 
well lighted, 22. 
heating of, 23. 
humidity in those with high gutters, 
25. 
Glasshouse construction, 17. 
in relation to air capacity and the 
ventilation factor, 21. 
in relation to the light factor, 18. 
Gleosporium, 117. 
Grape mildew, 34. 
Growth : 
at night, 18. 
effect of light on, 18. 
maximum, 23. 
Gummosis of hyacinth, 53. 
Gypsum, 168. 
Hardpan : 
effect on growth of plants of, 15. 
Head space, 22. 
Heating : 
cost of, 24. 
Heterosporium echinulatum, 106. 
Horse nettle, 66. 
Humidity of glasshouse atmospheres, 
24, 38. 
Humidity : 
effect on foliage, flowers, setting of 
fruit and disease, 24. 
effect of low, 24. 
epidemics associated with high, 39. 
limiting factor in many diseases, 24. 
relation to spore production, 24. 
relation to temperature, 25. 
relative requirements of different 
crops, 38 
Hunger, 147. 
Hyacinth : 
gummosis of, 53. 
Hybridization, 192. 
Hydrangeas, 69. 
Infection centres, 28. 
Impervious stratum, 15. 
Imported plants as disease carriers, 30. 
Iwanowski, 146, 147. 
Johnson, 38. 
Jones, L. R., 37. 
Kitasato filter, 148. 
Leaf diseases, 88. 
