94 WAVES OF SAND AND SNOW 



Ripples in Snow-sand. 



Mode of formation of granular snow or '' snow-sand " — 

 Rate of movement — Growth and movement more rapid 

 than those of sand-ripples — Measurements of length and 

 height — Obliteration in lee of larger ridge. 



Forms Produced by Wind-erosion in Compact Snow {Studies in 

 Canada). 



Measurements of transverse ridges, facing up-wind — Shape 

 of pits — Longitudinal structures — Note on the longitudinal 

 sand-dunes of the great Indian Desert. 



The Eddy Form of Snow-waves and Snowdrifts. 



Complex forms of drifts produced by fixed obstacles — All 

 contained by a boundary curve having blunt head and 

 fine tail — This is the boundary of the eddy caused by the 

 obstruction — Complex forms are stages of filling in of 

 eddy-space and due to insufficient supply of snow — The 

 eddy-curve and its relation to the forms of fish and 

 cetaceans — Of the wings of birds — Of the submerged part 

 of ships — Of torpedoes and non-rigid airships — Forms of 

 holes scoured out in snow round the trunks of trees — 

 Relation of snow-barchans to the eddy-curve — The relation 

 of form and movement between the travelling crescentic 

 snowdrifts and the swirl made in water by an oar — Shape 

 of the eddy in snow-waves — Inference as to the distance 

 to which hedges and belts of trees extend shelter from 

 wind. 



On the Three Modes of Deposition of Drifted Material depending 

 upon Rate of Subsidence. 



Behaviour of gravel, sand, and dust before the wind — Of 

 shingle, sand, and mud under the action of waves and 

 currents — Single tail of sand behind a narrow obstacle — 



