1096. Great anomalies are found in the comparative height in which the same plant will grow in different circumstances. In countries situated under the equator, the two sides of the mountain are of the same temperature, which is solely determined by elevation ; but in countries distant from it, the warmest side is that towards the south; and the zones of plants, instead of forming lines parallel to the horizon, incline towards the north. The reason, in both cases, is sufficiently obvious. In the temperate zone we find the same plants frequently on low and elevated situations; but this is never the case between the tropics.
