ence to the whirling of stones driven round and round 

 by the force of melted ice. In geology these holes or 

 pots are known by the name of Glacier-mills. The stones, 

 whirled round by the water, ground the rock, and at 

 the same time polished themselves, as the two samples 

 of Mill-stones lying in this Mill amply prove. 



IVo. ^ is a Glacier-mill with two Grinders left; 

 most of them have been removed in order not to impede 

 the inspection of the mill. The spiral windings, worn by 

 the immense force of the water, falling from a great height 

 of the glacier and whirling round from East to West, are 

 clearly visible. 



JVo. 3 is the Mill that was first discovered of all, 

 and had the sad fate of being almost destroyed, the value 

 of the interesting discovery not being yet known. 



JN"o. 4 is a layer of Rocks abounding with fossils of 

 sea shells, showing that the whole country situated at the 



foot of the Alps was once covered by the sea. 



IVo. & shows the petrifaction of a palm leaf dis- 

 covered by the breaking of a stone near the Garden. 



On this small spot of ground you have, therefore? 

 before your eyes different pages of the history of our 

 earth; for the country where we are now, once presented 

 various aspects: No. 4 dates from the period when the 

 ocean covered the land, No. 5 represents the period 

 when tropical heat produced tropical forests; in the 

 Glacier-Mills we have the debris left by the ice that 

 once covered all the Northern hemisphere. Thus the 

 aspect of the earth was changed in the course of mil- 

 lions of years. 



No. O is another Glacier -mill the border of 

 which has been slightly injured. Its spiral windings, 

 however, are very distinct. There are two Mill-stones, one 

 appears to have formed a complete circle, the other a 

 half-circle. 



IVo. 7". A mighty mill-stone (HOCwt), that 

 was excavated in the year 1875 out of the depths of 

 No. 11, the largest glacier-pot. 



