We propose to demonstrate in this paper that the chromocytes of different animals are covered by a layer of lipoids just two molecules thick. If chromocytes are taken from an artery or vein, and are separated from the plasma by several washings with saline solution, and after that extracted with pure acetone in large amounts, one obtains a quantity of lipoids that is exactly sufficient to cover the total surface of the chromocytes in a layer that is two molecules thick. Subsequent extractions with ether or benzene yield only small traces of lipoid substances.We therefore suppose that every chromocyte is surrounded by a layer of lipoids, of which the polar groups are directed to the inside and to the outside, in much the same way as Bragg (1) supposes the molecules to be orientated in a "crystal" of a fatty acid, and as the molecules of a soap bubble are accordingto Perrin (2). On the boundary of two phases, one being the watery solution of hemoglobin, and the other the plasma, such an orientation seems a priori to be the most probable one. Any other explanation that does not take account of this constant relation between the surface of the chromocytes and the content of lipoids seems very difficult to sustain.Technique.

we have used. Comparing the results obtained with counters {c') and {d') with the corresponding results obtained from (c) and (d), a small increase in the coincidence rate is noted. Considering the fact that the counters (c f ) and (d f ) are more sensitive to photons of low energy, the increase in the number of coincidences observed can be explained by the hypothesis that a fraction of the coincidences are due to the association between 7-radiation and x-rays subsequent to iT-capture. A sensible increase in N is obtained only for counters with KF (A?>-A^=0.48:db0.26) and not for those with KG, This agrees with the hypothesis that the increase is actually caused by x-rays of the K a line of argon which are strongly absorbed in chlorine.The hypothesis that there is an association between iT-capture and 7-radiation justifies the magnitude of the observed effect.

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