CHAPTER XV 



HINTS AND EXPERIMENTS 



IN this chapter I have collected together the points 

 that must be borne in mind by those who wish to 

 test humogen experimentally, expressing them in the 

 briefest possible form. I have suggested a few model 

 experiments as a guide, but naturally the most 

 interesting results will be obtained by those who 

 design and carry out experiments for themselves. 

 In conducting experiments every fact observed 

 should be carefully noted down at the time, and the 

 progress of experiments should be recorded by photo- 

 graphs at frequent intervals. All dates, especially 

 such as that of the first appearance of the shoot above 

 the soil, of the first bloom and of the first matured 

 fruit should be noted. Invariably there should be 

 control experiments that is, experiments in which 

 plants have been treated without any other differ- 

 ence except for the omission of humogen. Valuable 

 results can also be obtained by testing humogen 

 against other manures. 



MISTAKES TO BE AVOIDED. 



Don't expect humogen to do all the work of the 

 gardener. The better the cultivation, the better the 

 results. 



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