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A simple technique for estimating the survival of eggs during their incubation in stream gravels by planting eggs in specially designed egg boxes is described. This technique ensures that all the live eggs and alevins present in the gravel at the time of sampling can be recovered. Survival can be calculated accurately from the ratio of the number of live recovered to the number of eggs originally planted and the errors caused by the loss of dead eggs and escape of live alevins from the sample area are avoided.

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In this paper it is not the hill-country on which cultivating implements can be used that we are concerned with; it is all that steeper country which has been regarded variously as "marginal" or "deteriorated land," and which also is the really difficult country to manage and keep in a productive state.