MEMOIRS OF THE NATIONAL ACADEMY OE SCIENCES. 



Chart showing the protection from insolation (/ircii bji blue. 



481 



Chart shoivintj the protection from insolation </ircn hij r(<t. 



Chart ahuiriny the effect of insolation thruuijh colored fluids 



rt Contiiminated. b Six colonit's iu whole plate. 



Chart shoiving the protection from insolation {/iven b}/ (jreeu. 



Chart shoH'infj the protection from insolation given by orange. 



S. Mis. 50 31 



