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a. - sg UNITED STATES GOVE! INT ®) a Memorandum . . . \ TO DIRECTOR, FBI (76~26295) pate: = 6/22/62 Re veon : SAC, SAN FRANCISCO (76-2887) (p) “7=%+—222 eT | eunjecr: atcos RANK LEE MoRRIS ea Vie on ascertained that Subject . Alcatraz inmate, had dug some & of the ventilator grill in his es: cell. These holes located by prison officials after carefully probing for them, since) meticulously ‘ camouflaged them. Alcatraz ; Penitentiary of: material out of one a of the holes in ell. nthis material is believed to be cement p: It is noted that 8 assigned to this hae cell on 9/10/61, and he denies making the holes, -¢laiming they were probably made before he was assigned 8° this cell. The FBI Laboratory is requested, if possible, to b ascertain the length of period that the enclosed cement paint-appearing substance was in use. It is reported that ; ordinarily a small amount of water is placed with the cement ie paint mixture and the possibility exists that the substance ‘ which 1s attached would have gone through a chémical reaction {> to the added water and t indicate the Tength of time that i this material was used by The FBI Laboratory is also requested to furnish an analysis of the material submitted. SUBJECTS AT LARGE ARE ALL CONVICTED BANK ROBBERS AND SHOULD R 1 6-25-62 LZ) FOR LAB ACTION & REPORT “OPY & SPECIMENS RETAINED IN LAB r G- Bureau (Encl. F 2 - San, Francisco( ie] ar 3 ra oo & o & 4 AUG 16 18:2 a 8 29S YO £13? 5 JUN (28% ay 195