102 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM [1885. 



on the heart's action, more especially on the auricular portion of it, 

 which was in the two cases in point in a pathological condition of not 

 infrequent occurrence in mammals and man, the publication of at least 

 one of them was deemed justifiable. 



For a review of the literature of the subject as well as for a descrip- 

 tion of my method of experimentation I must refer, in order to avoid 

 repetition, to the studies from the Biol. Lab. Johns Hopk. Univ., vol. iii, 

 No. 2, p. 73, and also to the last number of the Proceedings of the Naval 

 Medical Society. 



February 28, 1884. Experiment I. Terrapin 10G5. Calf's blood and 

 Einger's saline 1 : 1. Cunulas in inferior vena cava, hepatic vein, pulmon- 

 ary artery and left aorta. Venous pressure 3.5"". Arterial pressure 

 14"". Atropized blood 0.0025 : lOO'"^ of blood-mixture. During recovery 

 the heart, being found specially delicate, low pressures have been used. 



