The cases tested.?The accompanying table gives the WR positive rate of a certain section, syphilitic suspects, of the civil population of Calcutta. It is by no means the positive rate for the mixed unselected population. The bloods for examination were received from general wards in hospitals and venereal clinics. The general wards predominated before the anti-venereal drive, towards the end of...

Simple countermeasures against passive (thermal) infrared intrusion detection systems (IDSs) and thermal imagers were tested in winter by U.S. Army Special Forces soldiers working with personnel of the U. S. Army Cold Regions Research and Engineering Laboratory (CRREL). Under certain site conditions, the countermeasures were very effective, enabling intruders to pass undetected by the infrared ...