METEOROLOGICAL CONDITIONS 



95 



I subjoin here a synoptical table of the meteorological observa- 

 tions made in the Russian empire in the years 1847, 1859, and 

 1879, which are specially distinguished by the occurrence of excep- 

 tionally powerful migrations from east to west. The material for 

 these data I owe, as I have already stated, to the extraordinary 

 kindness of Professor Neumayer, to whom I would here express 

 my warmest thanks. 



