CONTENTS
Winifred Elsie Brenchley
CHAP.
PAGE
I.
Introduction
1
II.
Methods of Working
7
I.
Discussion of Methods
7
1.
Water cultures
7
2.
Sand cultures
8
3.
Soil cultures in pots
9
4.
Field experiments
9
II.
Details of Methods
10
III.
Effect of Copper Compounds
15
I.
Presence of Copper in Plants
15
II.
Effect of Copper on the Growth of Higher Plants
17
1.
Toxic effect
17
(a)
Toxic action of copper compounds alone in water cultures
17
(b)
Masking effect caused by addition of soluble substances to solutions of copper salts
20
(c)
Effect of adding insoluble substances to solutions of copper salts
22
(d)
Effect of copper on plant growth when present in soils
24
(e)
Mode of action of copper on plants
25
2.
Effect of copper on germination
27
(a)
Seeds
27
(b)
Spores and pollen grains
28
3.
Does copper stimulate higher plants?
28
4.
Action of copper on organs other than roots
30
(a)
Effect of copper sprays on leaves
30
(b)
Effect of solutions of copper salts on leaves
General Index
109
List of Illustrations
x
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