Mr. STOMBAUGH. We have found that the fine-filtered vacuum cleaner pulls all of the dirt and old debris from a blanket which are embedded on the inner portion of the fabric. We are not interested in this material. We are interested only in what is adhering to the top surface, which has been put there most recently. Through experience in the laboratory we have found this method to be the best so far. Mr. EISENBERG. So that by use of the scrape you gathered the more recent debris, as opposed to the older debris? Mr. STOMBAUGH. That is correct. Mr. EISENBERG. And what type of debris did you find, Mr. Stombaugh? Mr. STOMBAUGH. I found numerous foreign textile fibers of various types and colors, as well as a number of limb and pubic hairs. Mr. EISENBERG. Did you draw any conclusions as to those hairs upon your initial examination of them? Mr. STOMBAUGH. Yes; I did. They all had originated from a person of the Caucasian race and I compared these hairs with hair samples obtained from Harvey Oswald---- Mr. EISENBERG. That is Lee Harvey Oswald? Mr. STOMBAUGH. That is, Lee Harvey Oswald, and I found that of the limb and pubic hairs I removed from the blanket, several matched Oswald's in all observable microscopic characteristics and could have originated from Oswald. Mr. EISENBERG. You said these hairs were from a person of Caucasian race. Can you explain how you can tell the difference between hairs of the various types of races? Mr. STOMBAUGH. Yes, sir. Going back to my charts, I have a chart here which contains a diagram of a hair. This isn't any particular hair, this is a type of hair that could be animal or human. I am just using this to give one an idea of what a hair looks like. First, we have the root, which is the portion of the hair embedded in the scalp or in the skin, whichever type hair it might be. (At this point, Mr. Dulles entered the hearing room.) Mr. STOMBAUGH. And from the root, extending out and growing, is the shaft of the hair, and the very distal end of that is the tip. If we were to take this hair and place it under a microscope, this is what we would see. We find that the hair basically consists, in the shaft area, of scales composing the outside portion of the hair. Directly under the scales is the cortex. Now the scales vary in size and shape among animal and human hairs. The cortex also varies. Running through the center of the hair shaft, much as the lead in the center of a lead pencil, is what is known as the medulla. The medulla is nothing more than air cells running through the center of the hairshaft. In the cortex of the hair are small granules which appear under a microscope like tiny grains of sand. These are known as the hair pigment. This is the part of the hair that gives the hair its color, whether it is blond, dark brown, black, or what-have-you.