118 THE AUSTRALIAN NATURALIST. 
ficial light at night has had a stimulating effect on these par- 
ticular branches, and induced the sap to flow for a longer 
period than under normal conditions. 
Having satisfied myself that through the influence of 
light, the leaves on these particular branches had been in- 
duced to remain on the branches, I thought it well to watch 
these particular branches in the spring, to note the develop- 
ment of the buds. 
On September 7th, all the trees began ‘to burst open 
their buds, and on the 17th of the same month, the leaves 
were fairly well developed. Those branches on the trees near 
the lights which had retained their leaves during the most of 
the winter, had the buds still unexpanded, on the above- 
‘mentioned dates ; and these did not commence to expand until 
September 27th, and even then only those on the lowest part 
of the particular branches were commencing to burst, whilst 
those on the tips nearest to the light were quite dormant. 
Further inspections were made on October 15th, and 
November 3rd, and still some of the buds were unexpanded, 
while as late as December 7th the last of the buds were just 
opening. é 
RECENT LITERATURE. 
(Australian Araneidac.) 
A census of Australian Araneidae hag long been required 
and this want has now been filled by the publication of one 
on a very complete scale by our fellow-member, Mr. W. J. 
Rainbow, F.L.8., issued as a,part of the ‘‘Records of the 
Australian Museum.’’ It will perhaps be a surprise to many 
to learn that some 1,200 species of spiders have been already 
described from Australia, while a large number of undescribed 
species are in the hands of various collectors and specialists. 
The present census will be of great value to future 
workers, bringing together as it does the scattered references 
to this important group, some of which are by no means easy 
of access in Australia. The value of the work is greatly en- 
hanced by a copious bibliography and synonymy, and a very 
full index of family and generic names. 
AUSTRALIAN Hyprozoa.—From the Australian Museum 
there has also been issued Part 16 of the Scientific Results of 
the “‘ Thetis ’’ trawling expedition. The present part is by 
J. Ritchie, M.A., B.Sc., of Edinburgh, and deals with the 
Hydrozoa. 
