Mehler, who proved that a simple relation existed between the function of zero order and the zonal harmonic of order n.
The relative value of any group of animals or plants for the correlation of distant areas must vary greatly with the varying conditions of sedimentation and with the precise definition of the zonal species and with many other factors.
Hot desert conditions are primarily found along the tropical belts of high atmospheric pressure in which the conditions of warmth and dryness are most fully realized, and on their equatorial sides, but the zonal arrangement is considerably modified in some regions by the monsoonal influence of elevated land.
Zonal data typically provide an aggregation of more micro scaled observations.
Winter Beauty, and in pots against the house a zonal pelargonium is a mass of flowers.