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The article presents a reply to the comments made by professor A.Steven Messenger on the author's article. North Indiana represents a broad ecological tension zone or region of contact, between the relatively mesic plant associations of Lower Michigan. The author is convinced that the final solution to all related problem will come only when the expertiser of several disciplines is focused on the lndiana Michigan dunes ecology to define positively the range of environmental stresses present and, simultaneously, to consider the limits of tolerance of the dune flora.

This study deals with human comfort expressed in a physio-climatic classification. Four physiological and psychological reactions of man to temperature. relative humidity, wind chill, and solar radiation are combined into two nomograms of which average human reactions can be deduced. Comfort and Wind Effect In dices are applied to meteorological data of the centerminous United States for July and January, daytime and nighttime, respectively, Maps combining both indices for July apply the classification on a larger scale (Southern California), and on a smaller scale (U.S.). A map of annual physio-climatic extremes synthesizes in generalized form how man tends to feel in various areas on a yearly basis. Thus a three-step system results which attempts to revise certain conventional notions about comfort regions. No paradoxical distributions are apparent and the classification seems limited only by the availability and reliability of data. The scheme is applicable to any dimension time or region, and is considered a contribution to medical geography, climatological education, tourism, military geography housing clothing and a general analytical tool introducing greater precision into geography.