Sentence:  According to him, although Bareges and Luchon are in this category, they are much inferior to Aix, where one has a <WSD>vaporium</WSD> of 40° to 45° C. (104° to 112° Fahr.), and so large a quantity of water that the different bathing operations can be varied to any extent. 
Meaning of the word marked with <WSD> tags:  A steam bath (room for taking steam baths).