1896.] «^*^ [Pepper. 



The President announced that he had appointed Dr. 

 Pepper, Dr. Frazer, Mr. Ingham, Mr. Jos. C. Fraley and Dr. 

 Hays the Committee for the special meetings agreed upon at 

 the last meeting of the Society. 



The Society was adjourned by the President. 



Eucalyptus in Algeria and Tunisia, from an hygienic and cUmatological 

 point of view. 



Bij Dr. Edward Pepper. 



{Read before the American Philosophical 'Society, March 6, 1S96.) 



INDEX. 



(hap. I. Division of Algeria and Tunisia into tliree zones, as regards climate, water, 



trees, healtli and population. 

 Chap. II. Chronological facts relating to the growing of eucalypti in Algeria and 



Tunisia. 

 Chap. III. General and special advantages of these trees. Limitations of their uses, and 



objections to them. 

 Chap. IV. Species and varieties most serviceable in Tunisia and Algeria. 

 Chap. V. When, where and how to grow them. 

 Chap. VI. Commercial value of eucalypti. 



I. 



Divisiox OP Algeria and Tunisia into Three Zones as Regards 

 Climate, Water, Trees, Health and Population. 



Algeria and Tunisia are properly divided into 



Division of three zones as regards climatological, liydrological 



Algeria and and botanical, as well as hygienic and etlmographic 



Tunisiaintothree conditions.* 



zones as above _,, , m, n i • • 



indicated. ^^^^ southern zone, ihe hahara, consisting gener- 



ally of a vast area of sand, moving and j^et in parts 

 solidified as by petrifaction (hamada), inhabited by semi-barbarous and 

 roving tribes ; and of oases of date-palms, inhabited hy settled and less 

 barbarous communities. 



The middle zone comprises the high plateaux, or steppes, covered 

 with a wild vegetation (herbaceous, fructiferous and rarely arborescent) 



* As regards purely hydrographical conditions, these countries are divided into only 

 two zones : the basin of the Mediterranean and that of the desert, all water not flowing 

 in the one flowing In the other direction. But as regards practical hydrology or 

 hydroscopy and its influence on the climate, these colonies are, as stated, properly 

 divided into three zones here described. 



