To the Editor:
—In The Journal, June 22, appeared a paper entitled "The Filtrable Elements of the Tuberculosis Virus (Tuberculosis Ultravirus)," by Calmette, Valtis and Saenz. As this article is a criticism on observations made and published by us (J. Infect. Dis.43:200 [Sept.] 1928) and as it contains some misquotations, we feel called on to reply. One reading this article and not familiar with the literature cannot help but form the opinion that the question as to the existence of such virus has been settled.1. The authors give only confirmatory references from the literature and do not mention the work of Fessler (Centralbl. f. Bakteriol.98:148, 1926), Dessy (Bol. Inst. Sieroterap.5:41, 1925), Montemartini (Bol. Inst. Sieroterap.4:1, 1925), Kirchner (Beitr. z. Klin. d. Tuberk.70:375 [Sept. 11] 1928), Lange and Clauberg (Ztschr. f. Tuberk.53:1 [Feb.] 1929) and others, who have