In a subsequent letter addressed to myself, Sir Charles has given me the names of those _urgent_ diseases which he considers may be treated by a mother, “where a medical man cannot be procured quickly, or not at all;” they are—Croup; Inflammation of the Lungs; Diphtheria; Dysentery; Diarrhœa; Hooping-Cough, in its various stages; and Shivering Fit. Sir Charles sums up his letter to me by saying: “Such a book ought to be made as complete as possible, and the objections to medical treatment being so explained as to induce mothers to try to avoid medical men is not so serious as that of leaving them without any guide in those instances where every delay is dangerous, and yet where medical assistance is not to be obtained or not to be had quickly.” In addition to the above, I shall give you the _treatment_ of Bronchitis, Measles, and Scarlet Fever. Bronchitis is one of the most common diseases incidental to childhood, and, with judicious treatment, is, in the absence of the medical man, readily managed by a sensible mother. Measles is very submissive to treatment. Scarlet Fever, _if it be not malignant_, and if certain rules be strictly followed, is also equally amenable to treatment. I have been fortunate in treating Scarlet Fever, and therefore think it desirable to enter fully into the _treatment_ of a disease, which is looked upon by many parents, and according to the usual mode of treatment, with just cause, with great consternation and dread. By giving my plan of treatment fully and simply, and without the slightest reservation, I am fully persuaded, through God’s blessing, that I may be the humble means of saving the lives of numbers of children. The diseases that might be treated by a mother, in the absence of a medical man, will form the subject of future Conversations. 197. _At what age does Water on the Brain usually occur, and how is a mother to know that her child is about to labor under that disease?_ Water on the brain is, as a rule, a disease of childhood; after a child is seven years old it is comparatively rare. It more frequently attacks delicate children—children who have been dry-nursed (especially if they have been improperly fed), or who have been suckled too long, or who have had consumptive mothers, or who have suffered severely from teething, or who are naturally of a feeble constitution. Water on the brain sometimes follows an attack of inflammation of the lungs, more especially if depressing measures (such as excessive leeching and the administration of emetic tartar) have been adopted. It occasionally follows in the train of contagious eruptive diseases, such as either small-pox or scarlatina. We may divide the symptoms of water on the brain into two stages. The first—the premonitory stage—which lasts four or five days, in which medical aid might be of great avail; the second—the stage of drowsiness and of coma—which usually ends in death.