In England in 1930, using a strain of Aujeszky virus, 1 I was unable by intracerebral or intramuscular inoculation to secure infection of a rhesus monkey. Remlinger and Bailly (1933) also recorded failure with another species--Inuus ecaudatus. With the Iowa strain of pseudorabies virus, and with an Hungarian strain, ~ intracerebral injection at Princeton (1932) was successful in each of 5 cases...