278 PEOPESSOB TYNDALL’S OBSEEYAIIONS ON THE SIEE DE GLACE. 
But this is not the case. In accomnsoda^g UseH to the change of inclinanon. 
the glacier breaks and is fissured in the manner e marking the limit at which 
The change of 'Sufficient to produce chasms of great magni- 
" a “iSlnient — rs. IBgher up ffie 
o.. „ a. .. 
Absence of the power of viscous f *XSttmselves to the attention of the 
glacier investigator , and deniers of the viscous theory have perhaps 
as entirely opposed to it. phenomena. The 
been influenced too exclusive y y pressure comes into play we have the 
analysis of ffie “^^y " but’ where tenZ is active we have evidences of an 
'■s".’.- .< .. - — >• •- 
“ill ... .—1, e— a™ 
When the mountain snow is fiist m t interstices. But as 
granules abut against eac ^^^^^zed more closely together; 
successive layers press up , / lat^n-n take ulace at the points of abutment ; 
“111- "i. — “■ 
water and air are expressed by the process, a ^ 
solidated. But although powerfully squeezed, each porti ^ 
rounded on all sides by a resisten ecoulement As far as 
s — almost a perfect siniilaiity between such an 
is applied, the^case " ““ 
mobility which chMactenzes to advance while another sUdes in 
round another while clinging ’ ,, j in which such a body can meet 
laterally to supply its place, being absen , the °^y ^ 3,,,i„ eoii- 
the requirements of a strain is by breaking, the fissuies 
p n crlrlnppd ill uroof of liscosity, and also 
Thus, I think, we take ^ J p „„ Jhich the opponents of the 
furnish a satisfactory explanation of the otiiei 
viscous theory have hitherto based then arguments. 
Boyal Institution, May 1858. 
• f of Mr Chkisxie witli a boinb-sliell filled Avith ivater and submitted to a 
* The ingenious experiment of Mr. t^HMSTiE n 
{reeling temperature, belongs, of course, to this class of e i s. 
