"(9) The local inflammatory reaction in animals which have died from plague occasioned by the bites of infected insects is either very slight or absent. In the latter case it is only by the situation of the primary bubo that one can approximately identify the area through which the plague infection entered the organism.
"(10) Infected fleas communicate the disease to healthy animals for three days after infection. Infected bugs have the power of doing so for five days.
"(11) It was not found possible for more than two animals to be infected by the bites of the same bugs.
"(12) The crushing of infected bugs in situ during the process of biting, occasioned in the majority of cases the infection of the healthy animal with plague.
"(13) The injury to the skin occasioned by the bite of bugs or fleas offers a channel through which the plague microbes can easily enter the body and occasion death from plague.
"(14) Crushed infected bugs and fleas and their fæces, like other plague material, can infect through the small punctures of the skin caused by the bites of bugs and fleas, but only for a short time after the infliction of these bites.
"(15) In the case of linen and other fabrics soiled by crushing infected fleas and bugs on them, or by the fæces of these insects the plague microbes can under favorable conditions remain alive and virulent during more than five months.
"(16) Chemical disinfectants do not in the ordinary course of application kill plague microbes in infected fleas and bugs.
"(17) The rat flea Typhlopsylla musculi does not bite human beings.
"(18) Human fleas do bite rats.