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No. 14. Wind-channel between two hills, showing destructive effect of mounds raised by sand-binding plants. [Photo L. Cockayne.
No. 16. Wind-trough caused by eddy from face of mound raised by planting Marram-grass. [Photo L. Cockayne.
No. 13. Natural foredune near Waikanae held by the Silvery Sandgrass (Spinifex hirsutus), forming an excellent protection to the COAST . [Photo W. H. Field.
No. 15. Marram-grass planted to arrest drift has built hills which HAVE LED TO WIND-CHANNELS AND FRESH DESTRUCTION IN CONSEQUENCE. [Photo L. Cockayne.
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