Page Eight 
THE SOUTH AUSTRALIAN NATURALIST 
July 1, 1948. 
Appreciation is extended to Sir Douglas 
Mawson, honorary mineralogist to the South 
Australian Museum, for the identification of 
much of the geological material referred to 
in this paper; Miss G. D. Walsh, Museum 
artist, for the drawings and Mr. A. Hay, 
Museum artisan, for the map. 
REFERENCES: 
Lindsay Black (1942). — Cy Icons, the Mystery 
Stones of the Darling River Valley. 
Cooper, H. M. (1947).— Australia: Material 
Culture. Incised Stones of South Austra- 
lia. Mankind, Vol. Ill (No. 1), pp. 292- 
298. 
Alison Harvey (1941). — Flint Implements of 
Tasmanian Manufacture found at Cape 
Hart, Kangaroo Island. Rec. S. Austr. 
Museum, VI, pp. 363-368. 
Tindale, N. B. (1937). — Tasmanian Abori- 
gines on Kangaroo Island, South Australia. 
Rec. S. Austr. Museum, VI, pp. 29-37. 
Tindale, N. B. (1937). — Relationship of the 
Extinct Kangaroo Island Culture, with Cul- 
tures of Australia, Tasmania and Malaya. 
Rec. S. Austr. Museum, VI, pp. 39-60. 
Tindale, N. B., and Maegraith, B. G. 
(1931). — Traces of An Extinct Aboriginal 
Population on Kangaroo Island. Rec. S. 
Austr. Museum, IV, pp. 275-289. 
Cooper, H. M. (1943). — Large Stone Imple- 
ments from South Australia. Rec. S. Austr. 
Museum VII, pp. 343-369. 
McCarthy, F. D. (1946). — The Stone Imple- 
ments of Australia. The Australian Mu- 
seum, Sydney. Memoir IX, pp. 45-64. 
THE YOUNG RESEARCHERS’ COLUMN 
No. 3 
Answers to problems printed in The S.A. 
Naturalist, Vol. 24, No. 1, Young Researchers’ 
Column No. 2. 
1. The White Cabbage Butterfly Caterpil- 
lars prefer cabbages and cauliflowers, but 
they will eat the foliage of other members 
of the group of plants known as Crucifers, 
that is plants that bear flowers having four 
petals set in the form of a cross. 
In addition, they have been found eating 
the leaves of the Garden Nasturtium or 
Tropaeolum ma\jus , which, by the way, is not 
a Nasturtium. The true Nasturtium is the 
Water Cress or Nasturtium officinale and be- 
longs to the group Cruciferae. 
The Garden Nasturtium belongs to the 
Order Geraniaceae and not Cruciferae, but 
having a strong, pungent taste like Water- 
cress, it seems to suit the caterpillar’s taste. 
Another plant that the caterpillars like is 
the Horse Radish or Cochlearia armoracea , 
which is a true Crucifer. 
NOTE: If you know of any other plants 
that the caterpillars of the White Cabbage 
Butterfly feed upon, bring forward the ob- 
servation at the next meeting of the Society. 
2. Clouds appear and disappear as they 
float across the sky because, heavier than air, 
they are constantly sinking towards the warm 
surface of the earth. As they sink they are 
warmed and turned into invisible water vapor 
which rises and in time becomes cooled and con- 
densed into a visible cloud. The course of a 
travelling cloud is undulating in form. 
3. Damaged fruit may be turning bad for 
several reasons, and as one reason is an 
attack by Fruit Fly. It is best to place the 
fruit in water and boil it to kill the Fruit 
Fly maggots. 
QUESTIONS 
1. In the jewellers’ windows one sees 
beautiful diamonds. What are dia- 
monds made of? Where are they 
made? 
2. How do the pretty markings get on 
egg shells and shellfish? 
3. Why does the wind blow harder some 
times than at others? 
