Many methods for calcium estimation by flame spectrophotometry have been described. Investigations of biological material have dealt chiefly with plasma (Baker, 1955; Chen and Toribara, 1953; Denson, 1954; Kingsley and Schaffert, 1953; Llaurado, 1954; Maclntyre, 1954; Mosher et al., 1951; Rothe and Sapirstein, 1955; Winer and Kuhns, 1953; Zak et al., 1953), with application to urine in some cas...

A VAST literature has accumulated on the strong correlation between exposure to high concentrations of oxygen during the postnatal care of premature babies and the development of retrolental fibroplasia (for reviews of the literature see Francois and others, 1954; Gordon and others, 1954; Henry, 1954; Ingalls, 1954; Lanman and others, 1954; Patz, 1954). Changes in the eye, similar to those seen...