McLean has used concentrated solutions of quinine intravenously several hundred times in cases of malaria (6 being blackwater fever ones) without any untoward results. He autoclaves his 10-grain solution of hydrochlor-sulphate in 10 cc. of sterile water for twenty minutes at 15 pounds, and injects it slowly into an arm vein, allowing about two minutes for the injection. The patients complain of a slight cough and hot feeling in the lungs with a succeeding dizziness which rapidly disappears. He is opposed to intramuscular injections and found intravenous ones diluted 1 to 250 often to cause shock and collapse. _Rectal Administration._—Some authorities recommend the administration per rectum of a soluble salt of quinine in about 3 times the usual dose by mouth or hypodermically. It is considered applicable in cases where there is marked vomiting. It certainly is the least satisfactory way of giving quinine. _Dosage and Length of Treatment._—In Panama the standard preliminary treatment is to give from 3 to 5 grains of calomel followed by 1 or 2 ounces of 50% magnesium sulphate. Fayrer holds that a torpid liver interferes with the efficient action of quinine, hence the value of calomel and salts. I prefer to give 2 or 3 grains of calomel, in divided doses, followed by sodium phosphate, 2 drams, every two hours, for three or four doses. _Standard Method._—The National Malaria Committee of the United States recommends the following treatment: Give 30 grains of quinine daily in three 10-grain doses. Keep this up for 4 days and follow by 10 grains every night for 8 weeks. Where the infection does not present acute symptoms give the 10 grains daily for 8 weeks. _Canal Zone Treatment._—So soon as the diagnosis is made give 15 grains of quinine 3 times daily (45 grains in twenty-four hours) and continue such treatment for a week or until the temperature has been normal for five or six days. Then give 10 grains 3 times daily for ten or twelve days. It is considered that by employing such thorough treatment from the beginning the tendency to latency or relapse is prevented—in other words the disease is really cured. It is interesting to note that Torti recommended large single doses at the commencement of treatment. Espach has noted that he had frequent relapses in many cases treated by this method. In my opinion the Canal Zone treatment should be followed by 10 grain doses daily for 8 weeks. Tonics of iron, arsenic and strychnine are valuable in treating the anaemia, but it is not advisable to add small doses of quinine to such tonic mixture. _Repeated Small Doses._—In Nocht’s method we give the quinine in small doses repeated several times in the day, as 3 or 4 grains given 5 or 6 times daily. Such treatment is thought advisable when there is a tendency to haemoglobinuria or when giving quinine to pregnant women.