390 



Collins ^^^^ describes the saltbush and bluebush communities of the Barrier 

 Range District, New South Wales. These are developed on plains of "both 

 sandy and alluvial soils, as well as in depressions which undoubtedly possess a 

 certain percentage of salts." The conclusion reached is that the weight of 

 evidence is in favour of the view that the master factor in their distribution is 

 climatic rather than the edaphic one of soil salinity. 



Text fig. 1. 

 Map of portion of South Australia showing contour lines of 500 and 1,000 feet, land over 

 1,000 feet stippled. S-, 10-, and 15-inch isohyets are shown, but not rainfall lines for 



higher precipitation. 

 (Based on a map published by the Geological Survey of South Australia, 1917.) 



Topographic. 

 The communities dealt with in this paper have been observed over a tract 

 of country running nearly 200 miles in a south-north line, from the River Murray 

 to Lake Frome (text tig. 1). From the Murray Basin the district extends northward 



(10) Collins, M. I., "Studies in the Vegetation of Arid and Semi-arid New South Wales" ; 

 Part 1, The Plant Ecology of the Barrier District, Proc. Roy. Soc, Linn. Soc. N.S. Wales, 

 vol. xlviii.; Part 3, 1923, p. 229. 



