1915] 



CONZATTI BOTANICAL GARDEN OF OAXACA 173 



leading from the Station building on the north. This 



t> 



was the main artery and at fixed points, which were carefully 

 selected beforehand, crosses were placed to mark the respec- 

 tive connections. These consisted of lateral ramifications of 

 smaller pipe which were to carry the water to the 35 irriga- 

 tion centers, 50 meters apart, into which the Garden is sub- 

 divided. 



All these centers must have nozzles, and at present there 

 are 18 of them in working order; these are marked with 

 crosses in fig. 2. To install them we have used 500 meters 

 of smaller piping, so that a similar amount, if not a little 

 more, would be required to complete the network. Of these 

 irrigation centers eight belong to the arboretum, twelve to 

 the systematic department, seven to the geographical depart- 

 ment, five to the fruticetum, and three to the propagation 

 department. As soon as the Botanical Garden has completed 

 its irrigation system and has a sufficient supply of water for 

 all seasons, we shall be able to consider its existence as 

 assured. 



SYSTEMATIC DEPARTMENT 



Together with the two preceding departments, the geo- 

 graphical and propagation departments, the systematic de- 

 partment constitutes the central part of the Garden, and from 

 the botanical point of view is the most interesting of them all. 

 Many plants have already been planted in it, as may be seen 

 in pi. 3, which represents the central part of the department ; 

 but the empty places are still numerous, and the need of 

 having them planted is great. The shape of this department 

 is that of an immense cup, 200 meters long and measuring 145 



meters at its widest part. 



As I have shown in a previous paper, which was published 

 some time ago in the 'Memorias y Kevista de la Sociedad 

 Cientifica " Antonio Alzate," ' of Mexico, and to which I now 

 refer for a better presentation of this subject, 'its interior is 

 subdivided into 45 large squares approximately equal, among 

 which are distributed the 277 phanerogamic families of the 

 " Syllabus" of Dr. Engler.' The plants in this department, 

 therefore, are arranged strictly in the order of affinity, 



