It is only in very large doses that it weakens the intracardiac nervous ganglia, slows and weakens the pulse, and dangerously lowers the blood pressure.
It will suffice if such a sail elevates and lowers itself successively.
It lowers itself - the front part of the wing strongly resists, the sail which follows it being flexible yields.
Carried by the ribbing (the anterior margin of the wing) which lowers itself, the sail or posterior margin of the wing being raised meanwhile by the air, which sets it straight again, the sail will take an intermediate position and incline itself about 45° plus or minus according to circumstances.
If the order of stratification differ from that of densities, we can show that each step of approximation to this order lowers the sum of tensions.