Flow to obtain tt. 63 
hours. As soon as the water in the pond had become thoroughly 
changed I allowed the stream to slacken considerably, and during 
the night it only ran as I had at first found it. The fish had 
recovered, and water was valuable, as we did not know for how 
many days the drought might continue. Next day, however, the 
operation of letting off more pools was continued, although with 
great care, no more water being sent down than was absolutely 
needful to keep the fish in a fairly lively condition. This 
operation was continued for five more days, when a friendly 
thunderstorm drenched the hills and sent down a copious supply, 
which did not fail again that summer. Before the next a supply 
had been obtained from another and a larger stream. 
In the instance I have just narrated the fish were not only 
benefited, but their lives were actually saved, by an artificial 
spate, and the great benefit arising therefrom will be plainly 
perceptible. So at any time during dry weather, although there 
may be no danger whatever existing, an artificial spate sent 
through a pond is an exceedingly good thing for the fish. It 
may be produced by contrivances of the roughest and simplest. 
kind. A few small dams should be made, not across the stream 
itself, but in any suitable corners close to it, where a trickle of 
water is obtainable to fill them. This means that there will be 
practically hardly any stream going through them, and thus they 
become excellent places for growing a crop of trout food, which, 
of course, goes down with the water into the fish ponds when 
the dams are let off. And here it should be observed that these 
dams should never be run dry. By only running half the water 
off, or at most three-fourths, a sufficient stock of living food is 
retained in them to keep up the required supply. 
Having made secure the point at which the water enters the 
pond, the next thing is to provide for its escape when the pond is 
full. There are many methods by which this may be effected. 
One that I have found to be in very general use, is to allow it to 
take the shortest possible cut over the embankment, in a channel 
the bed and sides of which are more or jess paved. They may, of 
course, be built of solid masonry. So far good; but there are 
many things to consider, which I find in most cases have not 
been thought of at all. Should the pond be in an exposed situa-. 
