(δ.) Epharmonic Variations.

Raoulia lutescens is an exceedingly stable type. In the Cass Valley careful examination of many cushions on grades 2 and 3 terrace showed no perceptible difference so long as they were well exposed. In a few instances cushions were found growing in the shade of large Discaria bushes and of Festuca tussocks; these showed a laxity of growth, with longer branchlets and greener leaves than usual. Such cushions were dead in many places, and the remaining portion appeared to be having a losing struggle with the quicker-growing herbaceous plants in its neighbourhood. Plants grown for six months in a moist greenhouse at sea-level showed a great elongation of the branchlets, a laxity of growth, and a production of larger, thinner, less hairy and consequently greener leaves.