 Having made an attempt to defend 17, it is time to turn to replies on behalf of the priority monist. The starting reply is that internal heterogeneity within the basic must be allowed by everyone. Or at least, the priority pluralist’s way of accounting for heterogeneity (above) is insufficient to account for all forms of heterogeneity. For there might be heterogeneity all the way down, in the sense of matter every part of which has heterogeneous proper  parts.[51]  If this is possible, it shows that the pluralistic strategy of accounting for heterogeneity in terms of differences between internally homogeneous parts is insufficient. In a partially similar vein, Taylor (1961: 88) claims that the pluralist can gain no advantage: