7) Mr Mines, On Pulsus alternans. 
DESCRIPTION OF PLATE I. 
Fic. 1. Frog’s heart. Top line of record shows contractions of an 
auricle (down-stroke = systole). Second line of contractions of ventricle. 
Third line electrogram by direct derivation of base and apex of ventricle. 
Einthoven galvanometer. High tension of quartz fibre. Sensitiveness 
—about 8 mm. deflection for 1 centi-volt. Alternation, developed 
spontaneously. Signal line indicates stimulation of sinws venosus with 
tetanising current of moderate strength. Time in seconds. 
Fie. 2. Frog’s heart. Arrangement as in Fig. 1. Description in 
text. 
REFERENCES. 
1872. Traupe. Berlin. klin. Wochenschr. 9, p. 185 (quoted by Starkenstein 
and others). 
1880. von Bascu. Miller's Archiv, Suppl. Band, p. 283. 
1882. GasKELL. Phil. Trans. p. 1017. 
1901. Hormany. Pflitger’s Arch. 84, p. 130. 
1905. VoLHaRD. Miinchen. Med. Wochenschr. 52, p. 590. 
1907. STARKENSTEIN. Z. exp. Path. u. Therap. 4, p. 681. 
1907. Musxens. Journ. Physiol. 36, p. 104. 
1908. Herine. Méiinchen. Med. Wochenschr. 55 (ii), p. 1417. 
1909. CusHuny. Heart 1, p. 1. 
1910, Winpir. Heart 2, p. 95. 
1911. Lewis. Mechanism of the heart beat (Shaw & Sons), Chapter 23. 
1912. Mines. Proc. Camb. Phil. Soc. 16, p. 615. 
