Errata. 



On page 19, first line, germs should read gums. 



On page 34, eighth line, Phospllc should read Phosphoric. 



On page 111, second line, Planting in should read Plowing in. 



On page 212, first line in last paragraph, difficulty should 

 read deficiency. 



On page 145, twentieth line, congulated should read coagu- 

 lated. 



