American journal of physiology . Occasionally the sequence of large and small contractions givesevidence of being compounded of two or more regular rhythms, asin the cases reported by Bowditch,^ and later by Woodworth,^ for thefrogs stomach preparation. The tracing of the first line in Fig. 3shows very clearly the presence of two rhythms, one slightly slowerthan the other, the resulting record being produced by the inter-ference of the two series of contractions working upon the lever at the same time. The secondtracing shows a primary series,and a secondary series ofsmaller contractions at as
American journal of physiology . Occasionally the sequence of large and small contractions givesevidence of being compounded of two or more regular rhythms, asin the cases reported by Bowditch,^ and later by Woodworth,^ for thefrogs stomach preparation. The tracing of the first line in Fig. 3shows very clearly the presence of two rhythms, one slightly slowerthan the other, the resulting record being produced by the inter-ference of the two series of contractions working upon the lever at the same time. The secondtracing shows a primary series,and a secondary series ofsmaller contractions at aslightly slower rate. The third,an apparently irregular curve,can be analyzed into twosimple rhythms, the rates ofwhich are indicated by the twohorizontal series of dots abovethe recorded curve. There is also some furtherevidence to support the viewthat this compounding ofrhythms points to the occur-rence of regular rhythmicalcontractions, with differentrates in different parts of theviscus. For example, when abladder at rest beg
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