37 



(2) That a clear, sminy day of relatively high temperature and dry atmosphere 

 gives the best condition for this work. This is shown by the larger number of seeds 

 obtained in the first experiment, although the same amount of pollen was used in 

 both cases, and also by the large proportion of double Howers obtained. 



Experiment in the culture of tropical ferns. — Au illustrated account of 

 tlie irietbods aud apparatus used in the culture of a maiden- hair fern 

 {Adiantum- cuneatum) from the spores. 



BULLETIN NO. 21, FEBRUARY, 1880. 



Kational feeding, C. a. Wulff, M. S. (pp. 3-16).— This bulletin 

 was prepared in response to the many inquiries on this subject received 

 from farmers by the Station. It contains au account of tlie chemical 

 composition of feeding stuffs, tables of analyses from American and 

 German sources, tables of feeding standards as worked out by Prof. 

 E. von Woltf, directions for the use of these tables, and useful practi- 

 cal suggestions for economical feeding. 



BULLETIN NO. 22, MARCH, 1889. 



Commercial fertilizers, H. A. Huston, A. O. (pp. 5-16). — This 

 bulletin contains popular explanations of technical terms and of tables 

 of analyses, a table of analyses of seventy-five fertilizers sold in the 

 State, and the full text of the Indiana law for fertilizer control. The 

 law is viewed as defective in not providing for a plan of inspection and 

 for the chemical work necessary to its enforcement. The fertilizers on 

 the market thus far tested have been found to agree with the analyses 

 of the samples furnished by the manufacturers. There is, however, 

 reason to believe that the law is evaded in the southern part of the 

 State. 



"The investigation of the needs of a given soil can only be made by 

 experiment, and the Station is prepared to give directions for such ex- 

 periments to those who desire it." 



'' It is estimated that 10,000 tons of fertilizers were legally sold in the 

 State during the past year. Of this amount 2,150 tons were manu- 

 factured in the State and 7,850 tons were imported. The estimated 

 commercial value of this is $340,000. Nearly one-half of the material 

 sold was ground bone. It is interesting to notice that more potash is 

 contained in the goods sold than formerly." From comparisons of- 

 amounts and composition of fertilizers applied and crops removed it is 

 inferred that "the soils of the State are becoming reduced in fertility, 

 and that a time is coming when much greater quantities of potash must 

 be supplied." " Experiments conducted here during the past ten years 

 indicate that our naturally rich soils become exhausted more rapidly 

 than it was formerly supposed that they would," 



BULLETIN NO. 23. 



Experiments with corn in 1S88, W. C. Latta, M. S. (pp. 3-112).-— 

 This article gives an account of field experiments with corn carried on 

 at this Station during the season of 1888, and compares them with 



