184 ^ 
and particularly the ground of La Limagne. Differences of 
level of upwards of 1000 feet occur in these fresh water 
deposits which demonstrate that great oscillations and 
disturbances took place since their deposition. These 
movements may with safety be assigned to that period of 
volcanic activity represented by the extinct craters of 
Auvergne. 
Errata^ 
Vol. XVI. No. 9. 
Page 157, For Crsetagus,” line 4 from bpttom, read 
“ Crataegus.” 
Page 158. For “variation,” line 5 from bottom, read 
“ venation.” 
