The susceptibility is laid by his inheritance, just as the susceptibility to psora is laid by our parents and the susceptibility to syphilis is laid by our parents. Man can only have one attack in his natural life-time of one of the three chronic miasms; a man cannot take syphilis twice, he cannot take sycosis twice, he cannot take psora twice. This is not known; a man when asked how many times he had gonorrhoea will say: “about half a dozen times;” but only one of these was sycotic.
The sycotic constitution cannot be taken a second time. One attack gives immunity to that person forever after. The offspring becomes increasingly susceptible to all the miasms the more they become developed in the human race. The more they become complicated with each other the more the human race becomes susceptible to acute and epidemic diseases. Now, you have a general survey of the chronic miasms.