34 
is most unwise to rely upon seedling trees producing fruit equal to 
that of the parent. “Rarely one may be found equal or even superior, 
but the great majority will prove of but low quality All cultivated 
fruits exhibit a strong tendency to revert to their original state, and 
when of arboreal habit can only be kept of good quality and true to 
their kind by working scions from proved varieties on suitable stocks. 
The bitter orange (Citrus bigaradia) is unquestionably the best 
stock for general use, but it has the disadvantage of being of slow 
growth. 
Under these circumstances it may prove advantageous to test 
the value of the indigenous Australian species as stocks for the 
ordinary cultivated kinds. Citrus-australis is a strong-growing species, 
attaining the height of thirty feet; it is a native of Queensland. CO. 
australasica is found in Queensland and New South Wales, extending 
to the Clarence and Richmond Rivers. It will probably prove the 
hardier of the two. In all probability, there would be but little diffi- 
culty in procuring seeds or young plants of either. 
The followmg species of Citrus are generally recognised by those 
botanists who have paid attention to the genus :— 
1. C. medica, Lin. The Citron. 
2. C. limonum, Risso. The Lemon. 
var., lumia. The Sweet Lemon. 
5 var., acida. The Lime. 
#5 var., limetta. The Sweet Lime. 
3. C. aurantium, Lin. The Sweet Orange. 
= var., nobilis. The Mandarin Orange. 
4. C. bigaradia, Risso. The Seville Orange. 
3 var., bergamia. The Bergamot Orange. 
5. ©. decwmana, Willd. The Shaddock. 
6. OC. australis, Planch. Native Orange of Australia. 
7. O. australasica, F. Muell. Native Orange of Australia. 
All the forms placed as varieties are considered distinct species by 
some authors. 
MULBERRY. 
So far as I am aware, the mulberry is attacked only by a single 
insect capable of inflicting injuries of a serious character, a species of 
borer, which excavates galleriesin the young shoots and branches, causing 
the affected tree to present a scrubby appearance, owing to the partial 
arrest of growth. The injuries were observed in July ; at present, I 
have been unable to secure specimens of the insect in any stage. 
OLIVE. 
SCALE (Lecanium oleae). 
The olive is frequently attacked by the black-scale, which forms 
Sere bodies on the twigs and leaves, sometimes in great pro- 
usion. 
