CALIFORNIA CITRUS CULTURE. 73 



tannin and the amount of water removed with the tent should be added 

 after each is dipped. 



The tannin solution should be brought to a boil and the tents immersed 

 for half an hour, after which they are removed and spread out to dry. 



A forty-five foot tent will shrink about one foot all around in dipping 

 (allowing for some stretching by use afterwards). 



The cost of dipping for tannin, fuel, labor, etc., amounts to about 

 $1.20 to $1.50 outside of equipment. 



Marking. Because of the shrinkage it is preferable to mark the 

 tents after dipping. 



The usual practice consists in marking three one and a half or two- 

 inch parallel lines across the tent three feet apart. Three lines are 

 made in preference to one, so that when the tent is put over the tree 

 one of these lines will be sure to pass over the center. The measure- 

 ments over the tree are ascertained by numbering each foot across the 

 tent, beginning in the middle, and numbering each way, as shown in 

 Fig. 47. The first four numbers are not designated because they are 

 seldom if ever used. The cost of marking and stenciling the numbers 

 averages about seventy-five cents a tent. 



Number for Outfit. The ordinary fumigating outfit consists ot 

 from thirty to forty tents, a number which five men are capable of 

 throwing and dosing at hourly intervals. An increase in apparatus 

 or men for handling and dosing will naturally admit of an increase in 

 this number. 



Care. Greatest care should be exercised to prevent acid coming in 

 contact with the tents, for every contact results in a large or small hole. 

 Every day each tent should be carefully examined and all holes covered 

 with sewed patches. Failure to follow these suggestions means poor 

 and unsatisfactory work. 



CHEMICAL WAGONS. 



Under the old system of scheduling and estimating, the dosage, for 

 every tree was made up at some central point in the orchard and dis- 

 tributed in carriers by hand. The new system of determining and 

 making the dosage of every tree separately gave rise to the chemical 

 cart or wagon, which carries a full supply of acid, cyanide and water 

 in easily available shape. 



The sulphuric acid should be kept in an earthenware or lead-lined 

 container and drawn off through a rubber siphon or outlet. An ordi- 

 nary keg or barrel with a faucet will hold the water and a tight box is 

 all that is necessary for the cyanide. Dosage schedules, graduates, 

 clamps, rubber gloves, scales and sufficient light complete the outfit. 

 (Figs. 50, 51.) 



