THE KANSAS UNIVERSITY 
SCIENCE BULLETIN. 
Vou. VI, No. 5] JANUARY, 1912. eine ea 
THE ACTION OF SALT SOLUTIONS ON STRIPS OF 
THE FROG’S. INTESTINE. 
BY GRACE RUSSELL. 
(Plate 23.) 
(From the Physiological Laboratory of the University of Kansas.) 
N this paper are briefly described the effects of salt solu- 
tions of various concentrations upon the smooth muscle 
fibers, especially the longitudinal, in the intestine of 
the frog. 
The effect of salt solutions upon smooth muscle fibers has 
been studied by many investigators, but the works of McGill,! 
Mathison,” Meigs,’ Stiles, Langley,> Menis* and Row’ I be- 
lieve correspond more closely to my problem than do the 
works of others that I read. 
The method employed was very simple. After the spring 
frog was pithed, the abdomen was opened, and pieces about 
one centimeter long were removed from the intestines as 
required. The segment was flushed with Ringer’s solution and 
attached to a writing lever at one end, properly weighted to 
secure tonicity of the intestinal strip, and suspended in a glass 
cylinder, into which the. solutions to be tested were carefully 
placed. The lower end of the segment was attached to a smali 
siphon tube, which drained the fluid. 
In each case a.record was first secured with the strip in 
McGill, C., 1910, Quarterly Journal of Experimental Physiology, vol. III, No. 3. 
Mathison, G. C., 1911, Journal of Physiology, vol. XLII. 
Meigs, E. B., American Journal of Physiology, vol. XXII, 1908. 
Stiles, P. G., 1903, American Journal of Physiology, vol. VIII, No. 4, p. 269. 
Langley, 1911, Journal of Physiology, vol. XLII, Proceedings, p. XXIV, 
Menis, 1911, Journal of Physiology, vol. XLII, p. 326. 
Row, R., 1904, Journal of Physiology, vol. XXX. 
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