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Fie. 12.—One of the streams of the River Cass (Canterbury) undermining the migratory 
river-bed association of the mat-raoulia (Raoulia tenuicaulis). 
Trans. N.Z, Inst.) [Photo, L. Cockayne. 
Fie. 13.—The low tussock-grassland at Cass (Canterbury), a climax plant-formation. 
The small cottage belongs to the Canterbury College Mountain Biological Station. 
Trans. N.Z. Inst.] [ Pkoto, C. FE. Foweraker. 
