For the Texas‐Louisiana coast west of 92.5°W, long series of data from near Freeport, Texas, together with shorter series from other locations, show strong response of coastal current to wind stress in agreement with coastal jet concepts. We infer from coastal winds, scattered current measurements, and distributions of sea‐surface salinity and geopotential that a cyclonic gyre elongated along the shelf is the dominant feature of the prevailing shelf circulation. The inshore limb of the gyre is the coastal jet driven by wind with a west or southward (downcoast) component which prevails along much of the coast except in July‐August. Because the coast is concave, the shoreward prevailing wind results in a convergence of coastal currents, which marks the downcoast extent of the gyre. Corresponding to the convergence is a seaward flow which forms the southwest limb of the gyre. A prevailing countercurrent (north or eastward flow) along the shelf break includes the outer limb of the gyre. The eastern, shoreward‐flowing limb of the gyre corresponds to divergence along the coast centered near 92.5°W. The convergence at the western or southern end of the gyre migrates seasonally with the direction of the prevailing wind, reaching south of the Rio Grande mouth in fall and the Cameron offing in July. The gyre is normally absent in July, but reappears in August‐September when a downcoast wind component develops.

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The nuclear reactions occurring in the solar interior which are thought to be responsible for solar energy production 1 may be verified directly, by observing the neutrinos created in the over-all reaction in the cycle (1) Bahcall 2 has obtained a theoretical spectrum of solar neutrinos, and has suggested the initiation of an experimental program of solar neutrino spectroscopy, based upon an observation of neutrino-induced nuclear reactions with various thresholds. Such a program would also check on details of solar models used in the calculation of the neutrino fluxes and provide a measure for the temperature at the sun's center. Most efficient for inducing nuclear reactions would be the neutrinos from the step B 8_ Be 8* + e+ + l (2) of the p-p cycle, because of their high energy (end point at 14.1 MeV). 3 So far, only experimental upper limits on solar-neutrino fluxes have been set; 4 positive results are expected shortly from two experiments now in progress. 5 ' 6 The experiment of Jenkins 6 proposes to detect the solar neutrinos in the reaction v +H 2 -2H 1 +e~, eby observation of the Cerenkov radiation of the electrons in a 2000-liter heavy-water target. The cross section and the electron spectrum and angular distribution of Reaction (3) are obtained theoretically in the following. 7 The conclusion is that the Coulomb repulsion will reduce the cross section only by an insignificant amount, so that solar-neutrino detection via (3) appears feasible.Calling v = neutrino momentum, T e (E e ) = electron kinetic (total) energy, p e -electron momentum, p = two-proton relative momentum, mp= proton mass, the kinematics of (3) gives v = Q + T +{p 2 /m ) e p (4)with a threshold of Q = 1.44 MeV. We use the conventional nonrelativistic weak-interaction Hamiltonian Gy + G^a^a^, where Gj± = -1.20Gy and Gy-\Q~~*mp~" 2 , and obtain the differential cross section da=2-2 Ti-3 G A l/l 2 A x (l-i?-p /vE )mbdQ p E dE dto ;3 *e e p y p^e e e e'it is isotropic in p, thus dQ,p = 2iT (identical particles), and shows a backward electron angular distribution. The following assumptions were made 7 : (1) The electron is treated as a free particle (as justified by its generally high energy).(2) The two protons emerge in a X S state; thus only the Gamow-Teller matrix element enters.(3) Retardation is neglected.(4) The effective-range approximation is used. 8 ' 9 Then the matrix element / containing the wave functions u^, U) exp[*(a + 6)]ATsin6fj-(r s +rJ/4C I (6b) where 9 ' 10 4TT^2 = 150 MeV, C 0 2 = 277rj(e 2 ' 7? ?-1)-1 , r} = (2pR)-1 , fl = 2.88xl0~1 2 cm, and (see Preston 10 ) C 2 p cotd+R-Mv) = ~« s -1 + \ r s P Z > a =-7.72xl0-13 cm, r =2.72x10-" cm, s ' s (7) r f = 1.71xl0 -13 cm, and J= L°°e yr [G 0 (pr) +F 0 (pr) cot6]dr;145