84 Bulletin No. 34. 



or two pounds of soap. The soap is dissolved in the water by 

 boiling, and when this mixture is still at or near the boiling point, 

 the kerosene is added, and the whole churned up until it is a 

 thick, cream}' mass. This can be kept and diluted with about ten 

 times its bulk of water for ordinary use. The writer has made 

 good emulsion in small quantities in a lard can, beating it up with 

 a large spoon. The emulsion can also be made with kerosene 

 and milk, in which case heating is not necessary. 



T. D. A. CockERELl, 



Visiting Entomologist. 



WHAT TO PLANT ON ARBOR DAY. 



No. 8, January 15. 



The planting of trees and shrubs for decorative and shade pur- 

 poses and to secure pleasing landscape effects is desirable in all 

 places inhabited by civilized, man. In nearly every state in the 

 Union a day has been set aside each year since 1885 for the pur- 

 pose of planting trees and to commemorate with appropriate ex- 

 ercises, in school houses and elsewhere, the great value of tree 

 planting from a civilizing and aesthetic standpoint. This day 

 throughout the United States is known as Arbor Day, and in 

 Arizona has usually been observed in February. Every one who 

 has a village lot or a farm should observe this day and plant trees, 

 shrubs, and vines, that their pleasing flowers and cooling shade 

 may give him pleasure in the days to come. 



The question that a great many will ask is, what had we best 

 plant in order to attain the most satisfactory results with ordinary 

 care and attention? For all Arizona this question cannot be 

 answered in a few words. Everything depends upon the moist- 

 ure, temperature, soil and cultivation. Without attempting to 

 enumerate the exotic plants that have been grown and should be 

 grown by those having plenty of water and ample time, and money 

 to pay for cultivation, I call your attention to a number of plants 

 that will thrive with little or no care and will survive prolonged 

 drouth. 



Too many trees have been planted in Arizona to live for a 

 year or two and finally die. The trouble in many instances has ; 



