Sir CHARLES LOCOCK, who has taken a kind interest in this little work, has given me valid reasons why a mother should be so enlightened. The following extracts are from a letter which I received from Sir CHARLES on the subject, and which he has courteously allowed me to publish. He says,--"As an old physician of some experience in complaints of infants and children, I may perhaps be allowed to suggest that in a future edition you should add a few words on the actual treatment of some of the more urgent infantile diseases. It is very right to caution parents against superseding the doctor, and attempting to manage serious illness themselves, but your advice, with very small exceptions, always being 'to lose no tune in sending for a medical man,' much valuable and often irremediable time may be lost _when a medical man is not to be had_. Take, for instance, a case of croup there are no directions given at all, except to send for a medical man, and always to keep medicines in the house which he may have directed. But how can this apply to a first attack? You state that a first attack is generally the worst. But why is it so? Simply because it often occurs when the parents do not recognise it, and it is allowed to get a worse point than in subsequent attacks, when they are thoroughly alive to it. As the very best remedy, and often the only essential one, if given early, is a full emetic, surely it is better that you should give some directions as to this in a future edition, and I can speak from my own experience when I say that an emetic, _given in time_, and repeated to free vomiting, will cut short _any_ case of croup. In nine cases out of ten the attack takes place in the evening or early night, and when vomiting is effected the dinner of that day is brought up nearly undigested, and the seventy of the symptoms at once cut short. Whenever any remedy is valuable, the more by its being administered _in time_, it is surely wiser to give directions as to its use, although, as a general rule, it is much better to advise the sending for medical advice."