1437
His experiments were almost entirely confined to " airs " , and out of this work emerged his most important scientific texts : the six volumes of " Experiments and Observations on Different Kinds of Air " ( 1774 – 86 ) .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None