Mr. EISENBERG. You will be called later for testimony on handwriting--I suppose you will be the person to testify? Mr. CADIGAN. Whenever you want me I will be available. Mr. EISENBERG. Did you examine the tape for microscopic--to determine the morphology of the fibers in the paper? Mr. CADIGAN. No. Mr. EISENBERG. Can you tell us why? Mr. CADIGAN. I didn't feel it was necessary. Mr. EISENBERG. I wonder whether you could do that, Mr. Cadigan, and send us a letter as to the results? Mr. CADIGAN. Certainly. (The letter referred to was later supplied and is set forth at the end of this testimony.) Mr. EISENBERG. And also, did you notice how the glue had been applied to the tapes? Mr. CADIGAN. Yes; you might say glue was applied all the way across the tapes. Mr. EISENBERG. There are no discernible differences in them? Mr. CADIGAN. The glue on the tapes would be applied with a brush at the time of manufacture. Mr. EISENBERG. Is there more than one way of applying glue? Mr. CADIGAN. Oh, yes. On some tapes, if you look at them either before or after they are used you will see a continuous line running right down the tape where they have used a wheel applicator, merely a difference in manufacturing methods. Mr. EISENBERG. But you found a brush applicator? Mr. CADIGAN. Yes. Mr. EISENBERG. Will the same manufacturer use two different methods? Mr. CADIGAN. He might or might not. Mr. EISENBERG. In your experience, is it likely that he would use two different methods? Mr. CADIGAN. I really couldn't say. Mr. DULLES. Mr. Cadigan, I thank you very much for your most interesting and helpful testimony. (Whereupon, at 1:50 p.m., the President's Commission recessed.) (Following is the text of a letter relating to the fiber composition of the gummed tapes in Exhibits 142 and 677.) UNITED STATES DEPARTMENT OF JUSTICE, FEDERAL BUREAU OF INVESTIGATION, _Washington, D.C., April 8, 1964_. [By Courier Service]. Hon. J. LEE RANKIN, _General Counsel, the President's Commission, 200 Maryland Avenue NE., Washington, D.C._ DEAR MR. RANKIN: During the testimony of Special Agent James C. Cadigan on April 3, 1964, before the President's Commission, Mr. Melvin Eisenberg of your staff orally requested Special Agent Cadigan to make a fiber analysis of the gummed tape on the paper sack found on the sixth floor of the Texas School Book Depository Building, Commission Exhibit 142, and of the sample of gummed tape in Commission Exhibit 677 Obtained November 22, 1963, at the Texas School Book Depository Building. Fiber analysis of the two gummed tapes in Commission Exhibits 142 and 677 revealed that they were similar in fiber composition. Sincerely yours, J. EDGAR HOOVER. _Tuesday, April 21, 1964_ TESTIMONY OF DR. ROBERT ROEDER SHAW, DR. CHARLES FRANCIS GREGORY, GOV. JOHN BOWDEN CONNALLY, JR., AND MRS. JOHN BOWDEN CONNALLY, JR.