I Supported by an appropriation from Industrial Research funds of Iowa State College, as a part of the program for the study of the utilization of wastes by fermentation. The assistance of Mr. Charles Davis in checking cultural characteristics of a number of organisms is acknowledged.

anti the I-enti-icle proper. This ()bervaticni, which appears to be Lrnique, together with further ei-itleiice from another case with auricular preiiiature lxats. strc msly suggests the presence of clecrenieiital conduction in the huniati heart. Even if the tracing be iiiterpreted as one of simple reciprocating rhythm, yet the extreme Ijeculiarity in question reniains, namely a descending impulse discharging the velitricular paceiiiaker yet failing to reach the ventricul ar niii sc 111 atu re.