Before entering upon a systematic study of the organism, a description of the manner in which specimens are obtained may be of advantage.
The technique of obtaining specimens for a fresh examination, though simple in theory, presents many slight, but annoying, difficulties in actual practice. The main points ever to be kept in mind are cleanliness, quickness and skill of hand and eye. The instruments necessary are a small lancet, two pairs of blood forceps, slides and cover slips. The site of puncture should be thoroughly cleansed, first with soap and water to remove dirt, secondly with alcohol to remove oily materials, and then allowed to dry.
Blood for examination may be taken from any part of the body. In adults the finger tip or lobe of the ear is most satisfactory. The writer has had most success in taking specimens from the lobe of the ear. Here there is