in making this subject the basis of a thesis I was prompted to do so for the following reasons. The cause of the disease is as yet unknown. Professor Osier in his Practice of Medicine defines the condition as "An anaemia of unknown cause, occurring in young girls, characterized by a marked relative diminution of the haemoglobin ". The studies of the Etiology of Chlorosis have been many and varied ,and numerous conditions have been cited as predisposing- or exciting causes of the disease,but although it is rendered evident that the disease results under very many diverse conditions, still,the essential factor in the evolution of the disease is as yet undetermined. As the disease is a common one, I thought it likely that material for observations would be easily procurable. The condition occurring as it does for the most part in the domestic servant class is a matter of some importance to the general public, as well as to the medical profession. Servants are very often unfitted for their duties on account of repeated attacks of this allment,a.nd if a cause could be found for the disease, and a means of prophylaxis brought forward, a great boon would be provided for many households.