410 R. H. CAMBAGE. 
ACACIA SHEDLINGS, Parr IV. 
By R. H. CAMBAGE, F.L.S. 
With Plates XXXI- XXXV. 
[Read before the Royal Society of N. 8S. Wales, October 2, 1918 | 
SYNOPSIS: 
VITALITY OF SEED IN SEA-WATER. 
SEQUENCE IN THE DEVELOPMENT OF LEAVES. 
NuMBER OF PINN& ON ONE LEAF. 
ABSENCE OF BIPINNATE LEAVES. 
DESCRIPTIONS OF SEEDLINGS. 
Vitality of Seed in Sea-water. 
In order to further test the vitality of Acacia seeds in 
sea-water, two seeds each of A. penninervis var. falciformis 
and A. melanoxylon, both from Jenolan Caves, N.S. Wales, 
which had been in sea-water for 469 days, were planted 
after having first been placed in boiling water, and one 
seedling of the former appeared in about two, and the other 
in six weeks, while a seedling of the latter came up in four 
weeks. 
A seed of A. Farnesiana from Central Queensland, 
remained in sea-water for 1,375 days, or 3% years, and was 
then quite hard and sound. After having been placed in 
boiling water it was planted, and germinated in a week. 
Sequence in the Development of Leaves. 
In previous papers of this series it has been pointed out 
that of 81 species of Acacia seedlings raised, 74 had one 
simply pinnate leaf, and this was succeeded by a bipinnate 
leaf. The remaining 7 species always produced an opposite 
pair of pinnate leaves, and these were succeeded by a 
bipinnate leaf. In afew instances a species usually having 
only one pinnate leaf was found to have an opposite pair. 
