102 AGRICULTURE FOR BEGINNERS 



In the picture, it is of course very greatly magnified. In 

 reality these bacteria are so small that about twenty-five 

 thousand of them side by side would extend only one inch. 

 Such small beings produce such great effects by their very 

 rapid multiplication, and ^ by giving off very power- 



// 4vji ful poisons. 



8 0. 6 -^5?S*S^ <S <f ^ 



8 $\ ^S 0y^H \ f\ Bacteria are so small 



J / ^ jib /^ / C, that they are readily borne 

 a o c d e )Y^ J v- 



on the dust particles of 



the air and are often taken 



a, grippe; I, bubonic plague; .diphtheria; ^ ^ ,, th h th 



d, tuberculosis ; e, typhoid fever 



breath or through water 



or milk. You can see how careful you should be and 

 what precaution you should take to prevent germs from 

 getting into the air or into water or milk when there is 

 disease about your home. You should heed carefully all 

 instructions of your physician on this point, so that you 

 may not spread disease. 



SECTION XXVII PREVENTION OF PLANT DISEASES 



In the last two sections you have learned something of 

 the nature of those fungi and bacteria that cause disease 

 in animals and plants. Now let us see how we can use 

 this knowledge to lessen the diseases of our crops. Farmers 

 lose through plant diseases very much that could be saved 

 by proper precaution. 



First, you must remember that every diseased fruit, 

 twig, or leaf bears millions of spores. These must be 

 destroyed by burning. They must not be allowed to lie 

 about and spread the disease in the spring. See that 



