Neither of the certifying medical practitioners may be the father or father-in-law, brother or brother-in-law, sister or sister-in-law, partner or assistant of the other of them. Great care should be taken to follow carefully the marginal directions on the certificate form. The most trivial omission will invalidate the certificate. The omission of the name of the street and number of the house is sufficient to set it aside. A medical man should remember that, although his certificate may have passed the scrutiny of the Commissioners, it is liable to be made the subject of discussion in a Court of law, and in cross-examination he will have to support the statements therein made. The following certificate properly filled up by Dr. Millar of Bethnal House Asylum, is given in his book on _Hints on Insanity_, and may be taken as an example of a correct certificate at that time, the present form being slightly different:-- MEDICAL CERTIFICATE PROPERLY FILLED UP 1. _Here set forth the_ I, the undersigned, _qualification entitling the_ _John Millar_, being a (¹) _person certifying to practise_ _Licentiate of the_ as a physician, surgeon, _or_ _Royal College of Physicians_, apothecary. _Edinburgh_, 2. Physician, surgeon, _or_ and being in actual practice as apothecary, _as the case_ a (²) _Physician_, hereby certify _may be_. that I, on the _third_ day of _November, One thousand eight hundred and eighty-eight_, at (³) 600 _Cambridge Road_, 3. _Here insert the street and_ _Bethnal Green_, in the county of _number of the house (if any_), _Middlesex_, separately from any or other like particular. other medical practitioner, personally examined _James Thompson, sen._, of 4. _Insert residence, and_ (⁴) 600 _Cambridge Road_, _profession or occupation_ _Bethnal Green_, _gentleman_, _(if any)._ and that the said _James Thompson, sen._, is a person (⁵) _of unsound 5. Lunatic, _or_ an idiot, mind_, and a proper person to be _or_ a person of unsound mind. taken charge of, and detained under care and treatment; and that I have formed this opinion upon the following grounds, viz.:-- 6. _Here state the facts._ 1. Facts indicating insanity observed by myself (⁶)-- _He is incoherent in his conversation, violent in his