[...] Temper, he remarked cheerfully, is the copyright trade-mark of the convalescent, but to John her sudden, unreasonable fits of anger and a feeling that in anyone but Lola he would have described as selfishness amazed and alarmed him. Dr. Barnhelm, too, seemed changed, but in his case the change was for the better. He was closeted all day, and often almost all night with his machine, and its low throbbing penetrated the whole building and brought[...].