World Resources 
currents make the ocean rich in phosphates. If we are looking 
right into the future, our descendants may be able to fertilize 
the ocean as well as the soil: with inland fisheries this is being 
done now. 
Hoagland: ‘There has been controversy recently in the United 
States over a technique to make a protein-rich concentrate by 
grinding up entire fish—scales, head, intestines, everything. 
These are waste fish not used by man for his table. This protein 
preparation has been condemned by the Pure Food and Drug 
Act as “filthy” food. Thus labelled it cannot be sold for human 
consumption. It would be much too expensive if they tried to 
clean the fish and just use the muscle. This looks like a good 
way to obtain quantities of animal protein. 
Coon: Within the last week or so that decision has been 
reversed and they have started to make whole-fish protein in 
Gloucester, Massachusetts. 
Klein: I think we should all once in our life read Malthus’ 
Essay on the Principle of Population. It is not altogether a pleasant 
book but plenty of the things we are discussing here today are 
actually to be found there already, in the successive, numerous 
and revised editions from 1798 onwards, and we should also 
remember that Darwin derived his own inspiration from Mal- 
thus. 
I enjoyed Professor Brock’s paper immensely, because, being 
myself a biologist in a medical school, I feel we have common 
interests in all that he has shown. We should be particularly 
careful about what Brock called additives, especially about the 
anti-oxidative substances which are added to things we eat and 
drink, and particularly the group of enzyme inhibitors (mono- 
bromoacetic acid or monoiodoacetic acid). 
In my own laboratory Karli has performed experiments on 
rabbits which show that extremely minute doses of monoiodo- 
acetic acid destroy the retina of the eye, and spermatogenesis 
suffers immediately too. Thus we are all getting in our daily 
food very small amounts of substances potentially dangerous 
to the condensed nuclei of cells. The whole group of enzyme 
inhibitors is to be included in this category. There is also 
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