| Description | Caption on reverse: Professor Shortt (right) who is famous for his discovery of the insect carrier of the deadly tropical disease kala-azar, and for his great work on malaria, is now studying the development of the parasite causing malaria. He has discovered that when a person is first infected with the disease, although he does not feel ill for some days, the malaria is developing meanwhile in his liver. Human volunteers are used for this work, and here, infected adult female mosquitoes are being held over a volunteer's skin so that he will be bitten by them. Later, a small piece of the patient's liver will be removed by operation for research workers to study. |