286 
PBOraSSOB TYNDALL ON THE YEINED STEUCTTEE OF GLACIEES. 
=S7:ri7= “ 
4 - •< .h ”X777.'“7™?.“'7S 
has also its “ structure mill ” at the base oi its cascade. Fig. ha is P 
off which I have produced by artificial pressure. 
Kg. 5. 
Fi". 5 a. 
It is to be borne in mind that the structure once lonu.u _ 
which hare no part in its formation ; it ® \ portion of tin- 
glaLr. I have sometimes seen the veined " , ,pHe above 
distance: there are some transverse mevasses „„oneous to infer from this 
Trelaporte which illustrate this; but it won e a 0^ josswre and hence, as a 
that the law which makes the structure perpendiculai to p . ^ 
general rule, transverse to the crevasses, hnds an ol-eiusscs 
fest that the structure which IS “to tiis mu longitudinal 
has been developed far higher up, that t t, obliterate it. To effect 
pressure to longitudinal strain the structure must be 
nViliteration a force commensurate with tnat wiueu p 
b“:; play, and at the place now referred to no such force exists. 
