NO. 29 VOLCANOES AND CLIMATE — ABBOT AND FOWLE 



Fig. 2. — Effect of dust on atmospheric transmission at Mt. Wilson, Cal., and Bassour, Algeria. 

 EE Vertical transmission ot atmosphere early June, 1912. 

 A A Transmission ratio: late June to early June. 

 BB " all July to early June. 



CC " all August to early June. 



1>1) haziest days to early June. 



