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productive capacity; —— larger bottom-samplers suited to this purpose can easily be 
constructed probably, with the one described here as pattern; only with the aid of 
such, specially suited apparatus are quantitative investigations possible. The 
dredge cannot be used. 
We have reason to believe, that certain, enclosed parts of fjords in Den- 
mark contain such a rich vegetation, that the bottom is less suited to hold a 
richly producing bottom-fauna; and we can thus imagine the possibility of being 
able to improve the bottom-conditions by cutting down a portion of the 
superfluous vegetation by means of sailing or steaming reaping machines. 
Such indeed have already been used in the large European freshwaters, where the 
vegetation has become too troublesome. We mention this here as an example of 
the fact, that an exact knowledge of the quantity of organisms at the different 
places, in addition to the mutual relations of the organisms, is necessary before 
we can venture to interfere in a right way in the workings of nature, and before 
we can judge of the consequences of the interference which is made already by 
man to such a great extent, especially in our smaller and very restricted, but 
obviously very productive fjords and small waters. 
So far as it lies in our power, our investigations will be continued and 
extended, so that they may be able to yield as accurate results as possible. 

