... true that in inmny of these I towns there had not becn any epidemic e of smallpox, ibut the saume ;Ding might be said of other tow.rCs. The occurrence a of an epidemic of smallpox depended upon many e causes. There wasno evrdence of any generalresis- i ...

... rioL been any epidemic of sM0otllox. But the siwle thing might be said of other towns. The occurrence of an enidc-mic of smallpox de- pended upon many causes. There was no evidence of any Vener1al increase of resistance to vaccine- tiom, the last returns ...