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' With feet ' , ' two-footed ' , ' winged ' , ' aquatic ' , are differentiae of ' animal ' ; the species of knowledge are not distinguished by the same differentiae . I was there specifically to learn about deep diving on compressed air , since we anticipated having to deal with exploring through deep underwater tunnels on an upcoming expedition . Jean Pierre Michel slid down beneath the water and laid his head back into the smooth cavity that had been carved , at the apex of the tub , to fit the exact dimensions of his cranium . Italian stonecutters had carved pretentious gargoyles and griffins in every available spot as if the amount of decoration justified the expense of their commission . But to Icelanders , history and myth are woven into the landscape itself . Lady Veula was inured to this sort of thing in her own home circle , and sat listening with the stoical indifference with which an Esquimau might accept the occurrence of one snowstorm the more , in the course of an Arctic winter . Her place in this town had been carved long before adulthood . Today , given the widespread availability of helium mixes [ which limit narcosis ] , few people dive deep on compressed air . When one has inured oneself to the idea of a particular form of victimisation it is disconcerting to be confronted with another . And St. James 's Park , with its lawns and walks and waterfowl , harbours still its associations with a bygone order of men and women , whose happiness and sadness are woven into its history , dim and grey as they were once bright and glowing , like the faded pattern worked into the fabric of an old tapestry . Approximately the size of a small grapefruit , it was carved to resemble the elusive fellow who peered down from the night sky over Manhattan .