Paper written by Adolpho Lutz in collaboration with Oswaldo de Mello Campos and published in 1922 in Memórias do Instituto Oswaldo Cruz (v. 15, fasc. 1, pp. 235-9 in Portuguese and pp. 138-42 in English); one print (no. 31). The paper had been printed in both languages in 1923 in A Folha Medica (year 4, no. 1, pp. 2-3). [E.N.]