50 



c 



Eesult, two days later, plant untouched ; grub active, but seemingly 

 uuaffected by application. 



Experiment No. 13. — October 6, earth in field in the vicinity of wheat 

 plants being' destroyed by white grub, thoroughly drenched with decoc- 

 tion of Burdock leaves. 



Result of examination on October 14 : The grub was found a short 

 distance from the plants uninjured, it having evidently destroyed several 

 after application of liquid. 



Experiment No. 14. — October 3, earth about wheat plants, being de- 

 stroyed in field by white grub, thickly covered with fertilizing salt and 

 drenched with water. 



Eesult of examination October 14 exactly as in the preceding, except 

 that the grub was at a greater distance from plants. 



Up to the present time, no Dipterous parasite has been recorded as 

 preying upon white grubs, as the subterranean habits of the pest con- 

 tributes to its protection in this respect. There is, however, pretty 

 good evidence that there is at least one species of fly which exists to 

 some extent in holding these grubs in check. On September 21, while 



who advertises both as not only being excellent fertilizers, but also very destruc- 

 tive to insect life, especially chincb-bugs and cut-worms. 



The following analyses were kindly made for me by Prof. Henry A. Huston, chemist 

 of Indiana experiment station: 



I. Phosphate salt. 



A. Qualitative analysis. 



Bases present : Acids present : 



Calcium, Hydrochloric, 



Sodium, Sulpburic, 



Iron, trace, Carbonic, 



Aluminium, trace, Silicic, trace, 



Magnesium, trace, Phosphoric, trace. 

 Organic matter, trace. 



Principal constituents : Common salt, gypsum, carbonate of lime. 



B. Per cent, phosp boric acid present, .03. 



II. Fertilizing salt. 



A. Qualitative analysis. 



Bases present : Acids present : 



Sodium, Hydrochloric, 



Calcium, trace, Sulphuric, trace, 



Organic matter, trace, Silicic, trace. 



Phosphoric, sligbt trace. 

 Chief constituent : Common salt. 



B. Quantitative analysis. 



Per cent. 



Salt(NaCl) 97.70 



Gypsum (CaSo) ■. 44 



Insoluble matter 47 



Moisture 1. 09 



Soluble organic matter and loss 30 



Total 100.00 



Samples drawn at experiment station from full sacks, special care being taken to 

 insure fair samples. Neither of these samples contain an appreciable amount of 

 phosphoric acid, potasb, or nitrogen. 



