r - Add legend category to ggplot2 line plot with two y-axes -

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i'm trying make graph using ggplot2 2 different y-axes (appropriate , not misleading, promise).

i've got legend first graph, can't seem able add 1 second. nor can label axis.

my code quite long-winded i've abbreviated coding of p1 don't think need change that.

p1 <- p + theme(legend.position = "top")     p2 <- ggplot(concb.only.for.r, aes(concb.ml, concb))              geom_line(colour = "#000099") + theme_bw() +         theme(panel.background = element_rect(fill = na)) +         theme(legend.position = "top") g1 <- ggplot_gtable(ggplot_build(p1))     g2 <- ggplot_gtable(ggplot_build(p2))      pp <- c(subset(g1$layout, name == "panel", se = t:r))      g <- gtable_add_grob(g1, g2$grobs[[which(g2$layout$name == "panel")]],         pp$t, + pp$l, pp$b, pp$l)      ia <- which(g2$layout$name == "axis-l")      ga <- g2$grobs[[ia]]      ax <- ga$children[[2]]      ax$widths <- rev(ax$widths)      ax$grobs <- rev(ax$grobs)      ax$grobs[[1]]$x <- ax$grobs[[1]]$x - unit(1, "npc") + unit(0.15, "cm")      g <- gtable_add_cols(g, g2$widths[g2$layout[ia, ]$l], length(g$widths) - 1)     g <- gtable_add_grob(g, ax, pp$t, length(g$widths) - 1, pp$b)      grid.draw(g)


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