38 CITRUS TREES AND THEIR DISEASES 



experiments that have been made in later years, they 

 have not discovered the real genuine fertilizer that 

 fills the requirements, needs and demands of a citrus 

 tree and its fruits. Humus is the prime factor. Fol- 

 lowing humus, minerals are largely needed, some phos- 

 phate and some nitrogen is also necessary. 



The writer stands ready to say that the formula 

 which he will enclose with this book, will be of more 

 value to the citrus growers of California than any 

 thing they have ever had handed down to them ; for if 

 they buy their owrt raw materials in the crude state, 

 manufacture it on their own premises, they certainly 

 lessen the cost of fertilization. The compounding of 

 this formula can be done by any common, ordinary, 

 sensible man, woman, or child ; as the larger part of it 

 means only work. 



Any man who uses this formula three years and 

 does not say he has received more value than from any 

 other method he has ever tested, he may quickly re- 

 turn the formula to the writer, and the refund of his 

 money will follow by return mail. The writer knows 

 whereof he speaks, and this book is only composed of 

 absolutely demonstrated facts. The writer does not 

 consider it wise to use a whole lot of surplus and un- 

 necessary language in this book. We must deal with 

 the matter in a careful manner and with as few words 

 as possible. 



Fertilizers contain only one element; for instance, 

 blood contains one element, bone another, tankage 

 another, nitrate of soda another, the writer com- 

 pounded the whole in one, together with the humus 



