THE 
TASMANIAN JOURNAL 
OF 
NATURAL SCIENCE. 
Art. I. On Irrigation in Tasmania. By Captain 
A. F. Cotton, Madras Engineers- 
(Continued from page 93 ) 
Having shortly examined the particular advantages of 
irrigation in this colony, and noticed some of the most 
important points connected with the subject, it remains 
to consider the means by which the water may be brought 
to the land. There are two principal modes of effecting 
this ; viz.— 
First, by channels led from rivers or tanks. 
Second, by raising the water by machinery. 
In the large rivers, such as the Derwent, South Esk, 
&c., which contain a large flow of water throughout the 
summer, it is, of course, only requisite to divert a suf¬ 
ficient quantity of the water so provided, from its natural 
course, to the land to be irrigated ; but if it be required 
to water a greater extent of land than such rivers can in 
their present state supply (and also to keep up a stream 
M 
VOL. I. NO. III. 
