Marrow puncture.

With the aid of lengthy opening intertitles, it is observed that blood disorders can be diagnosed by studying bone marrow tissue. The modern technique is described as simple and straightforward. The various instruments are illustrated - on small wood panels for instance. Bones suitable for marrow puncture are demonstrated on a skeleton (which is exhorted to 'stand up please' and is duly hoisted up). The procedure in different sites is shown on patients (an adult male, an adult female, a three year-old girl and a six year old boy). Some faults in technique are included in a lighthearted section at the end of the film; the doctor demonstrates a comically poor bedside manner - the patient also endeavours to escape!