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The cells of origin of the long descending propriospinal tract (LDPT) in the cervical enlargement were studied in cat and monkey by using the retrograde transport of horseradish peroxidase (HRP). Their distribution was confirmed electrophysiologically in cat by recording their antidromic action potentials. In cats and monkeys unilateral injections of HRP were made into the gray matter of the lumbosacral enlargement, but there was some spread to the contralateral side. In cats labeled somas were found in greatest numbers in lamina VIII and medial lamina VII, bilaterally. Labeled cells also were found bilaterally in laminae I, IV--VI, and X, but few were in IV and VI. Those in lamina V were usually in the lateral part of the lamina near the reticulated region. The cross-sectional areas of 20 neurons from each of laminae I and V--VIII were measured. Cells in lamina I were smallest and the largest were in VII and VIII. In cats with the spinal cord hemisected between the injection site and the cervical enlargement containing the somas, the bilaterality of the LDPT neurons in laminae VII and VIII was confirmed anatomically and physiologically. Contralaterally projecting neurons in laminae VIII and medial VII constituted a majority of LDPT cells in those laminae. The LDPT neurons in the dorsal horn appeared to project mainly ipsilaterally, but the number of labeled dorsal horn cells in these preparations was small. The distribution of antidromically localized cells of the LDPT was found to be in good agreement with the anatomical results. Their conduction velocity was 59 +/- 22 m/s (mean +/- s.d., n = 245). Histograms of the conduction velocity by laminae are given. In monkey the distribution of labeled somas was similar to that in the cat, except that the concentration of labeled somas in the ventral horn was more medially and dorsally located. Labeled somas were found bilaterally in laminae I, IV--VIII, and X, but more appeared to be ipsilateral to the side of the injection, especially in the dorsal horn. The bilaterality of the LDPT in the monkey was not tested with hemisections of the spinal cord. Neurons of the LDPT are ideally situated for conveying sensory information from the forelimb for eliciting reflexes in the hindlimb, as has been observed after stimulating afferents in the forelimb, and for coordinating, in general, motor functions between the two pairs of limbs.

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In an experiment at the Brookhaven alternatinggradient synchrotron, we have analyzed ~3.2 million r decays (i^-77*77*77*), ~1.6 million for each charge of the kaon. The purpose of the experiment was twofold: (1) To search for a violation of CP invariance in T decay by comparing the r + and T~ Dalitz plots. Any difference would indicate a CP violation outside the neutral kaon system, and hence one which could not occur via the "superweak" interaction. 1 (2) To determine the structure of |M| 2 , the square of the r-decay matrix element. All existing data on r decay 2 (1964). ., Phys. Rev. Lett. 225, 374 (1969).^Instead of using the coincident 7r + 7r"~ rates, we used the single-arm pion rates, since, for the average of the polarization at the four points of highest polarization, they gave (± 1.0 %) the same value for P as did the coincident rates. This allows us to study the angular dependence of Fig. 2 with better statistics. The fact that the production plane of single pions photoproduced from complex nuclei can serve as an analyzer is entirely reasonable. That is because the dominant source of such pions is photoproduced p° mesons. These are concentrated in a forward cone which is small compared with the p° decay cone. As a result, detecting a single pion from the decay fixes the decayplane azimuth with fair accuracy. This assumption yields an upper limit for the analyzing power. 12 G. E. Bacon, Nature (London) 166,, 794 (1950). 13 D. Cromer and J. Waber, Acta Crystallogr. lis, 104 (1965). 14 Do Luckey and R. Schwitters, Nucl. Instrum. Methods 81, 164 (1970).(-58 000 r~, -37000 r + events) are consistent with the linear approximation \M\ 2 dXdYaz(l+aY)dXdY, where a is a constant, and X= V3" \T 1 -T 2 \/Q and Y-(3T 3 -Q)/Q are the Dalitz-Fabri coordinates. 3 Here T 1? T 2 , and T 3 are the cm. kinetic energies of the two "even" pions (same charge as the kaon's) and the "odd" pion, respectively; Q = 7\ + T 2 + T 3 . In addition to reducing the uncertainty in the slope parameter a, this high-statistics experiment should give new information as to the presence of higher terms in the expansion of \M\ 2 . In this Letter we report the final resultsWe report a comparison of the Dalitz-plot distributions of 1.6 million T + decays (K + -*"7r + 7r + 7r"") and an equal number of r""decays. No significant asymmetry has been found in any region of the plot. In terms of the difference in the slope parameters a + and a~ for the odd-pion cm.-energy spectra, the asymmetry is A= fa + -a~)/fc + +a~) = -0,0070 ±0.0053. We also present a preliminary result for the slope parameter itself: a = 0.283 ±0.005. New measurements of the r* decay rates and their difference confirm previous results.1370