8 2 HE WORLD'S LUMBER ROOM. 



miles long and one million deep, and a celebrated American 

 astronomer calculates that on an average there fall to the 

 earth every day 7,500,000 of a size to be seen by the 

 naked eye, and 400,000,000 which might be seen through 



Fig. 3. ORGANIC MATTER FOUND AFTER THE EVAPORATION OF SNOW 



(Magnified 500 times.) 



a telescope of moderate power, and that, with the fine dust 

 which accompanies them, the daily weight falling upon 

 the earth does not come short of a ton.* 



But the observations of Professor Nordenskjdld lead 

 him to go much farther even than this. Where the dust 

 falls upon roads or fields there is of course some difficulty 



* Single meteorites sometimes weigh several tons. 



