"Tight collar he'll lose his hair. Better leave him the paper and get shut of him.
- You can keep it, Mr Bloom said." (U5.529)

A tight collar impedes blood circulation. This ad in Pearson's Magazine (1905) makes it clear: 'Baldness and falling hair are caused by the lack of proper nourishment of the hair roots. This lack of nourishment is due to the absence of blood in the scalp - an abnormal condition. It is the blood which conveys nourishment to the hair roots as well as to every other part of the body. If you want the hair to grow on the scalp the blood must be made to circulate there.'