For years I have been making blood examinations, and it has been my lot to fail many times to secure a drop of blood for examination, especially from very old and anemic patients; failures mean repeated attempts, which add to the pain and annoyance of the patient.
Practically all my failures were due to the manner of drawing up the blood into the pipette. Because of this I looked about for an apparatus to replace the rubber tubes and the sucking process and, finding none, attempted to have carried out some of my own ideas. After many failures I succeeded in having made the present apparatus, and that with undreamed of simplicity of mechanism.
The attachment is slipped over the end of the blood pipette and clamped into place; the roller is moved up, but preferably not all the way, to the clamp end. This makes it possible, as the