indicating that the structure of the reverse micellar assembly was retained.13The systems studied here show the potential for higher ordering that chemical oscillators can display with the addition of spatially ordered features. Such a situation could have been important at some point in chemical evolution. In a more specific manner it may be envisaged that successive accretion of different types of ordering was a central process in the chemical evolution of life. We note that adding the effect of spatial organization to the hypercycle accentuates its selectivity.14 Acknowledgment. G.A.R. thanks the Centre for Cellular and Molecular Biology for the facilities to carry out this research at that laboratory.