Apr.-Sept., 1914 
Illustrations 
XI 
Page 
Fig. 3. Eremocitrus glauca: Seedling plants grown from seed from near Chin¬ 
chilla, Queensland, Australia. A, young seedling with hypogeous 
cotyledons still inclosed in the seed coats, natural size; B, an older 
seedling with a very long taproot, natural size; C, a cataphyll. 88 
4. Eremocitrus glauca: Flower from which petals and stamens have fallen; 
showing pedicel, calyx (one sepal cut away), disk, ovary, style, and 
stigma; from a specimen collected by Robert Brown, Sept., 1802 (?), 
Upper Head, Broad Sound, Queensland; in National Herbarium, 
Washington, D. C. 89 
5. Eremocitrus glauca: Cross section of leaf from near Forestvale, Queens¬ 
land, collected by T. L. Mitchell on October 17, 1846; in Gray Her¬ 
barium . 93 
6. Eremocitrus glauca: A hair from the leaf of a plant grown from seed from 
near Chinchilla, Queensland. 94 
7. Eremocitrus glauca: Cross section of the epidermal region of a 1-year-old 
twig from near Forestvale, Queensland, collected by T. L. Mitchell 
on October 17, 1846; in Gray Herbarium. A , thick-walled epidermis, 
two strata of palisade cells, and inner cortical parenchyma; B, a 
stomate at the bottom of a deep narrow pit. 94 
Relation op Bacterial Transformations of Soil Nitrogen to Nutri¬ 
tion of Citrous Plants 
Fig. 1. Diagram showing relative nitrogen-fixing power, nitrifying power, and 
salt content of soil samples from good and poor areas in an orange 
grove which was unproductive and markedly chlorotic throughout. 
The good areas were themselves very unproductive. Black columns 
show good areas; hatched columns indicate poor areas. 102 
2. Diagram showing relative nitrogen-fixing power, nitrifying power, and 
salt content of good and poor areas in an orange grove that produced 
a fair crop of marketable fruit. The poor areas were unproductive. 
Black columns show good areas; hatched columns indicate poor areas. 103 
3. Diagram showing relative nitrogen-fixing power, nitrifying power, and 
salt content of soil samples from good and poor areas in an orange 
grove which showed decided symptoms of chlorosis associated with 
small yields of low-grade fruit. There was but a slight difference in 
the vigor of the orange trees growing upon the good and the poor 
areas. Black columns show good areas; hatched columns indicate 
poor areas. 103 
4. Diagram showing quantities of salts found in crust samples of soil from 
the same areas illustrated in figures 1,2, and 3. 104 
5. Diagram showing effect upon nitrate nitrogen in samples of California 
soil of additions of 2 per cent of green vetch, green barley, and ma¬ 
ture barley straw. 108 
6. Diagram showing effect upon total nitrogen, not including nitrate 
nitrogen, in samples of California soil of additions of 2 per cent of 
green vetch, green barley, and mature barley straw. no 
7. Diagram showing effect of additions of 2 per cent of green vetch, green 
barley, and mature barley straw upon the nitrifying power of samples 
of California soil. no 
