11. Observations in the Vegetation House. 



1. Observations with different forms of potash, phosphoric acid 

 and nitrogen on garden crops (C. A. Goess>[ann). 



2. Experiments with Philadelphia tankage and dried blood 

 as a nitrogen source for the raising of winter grain (rye) (C. A. 

 Goessjiann) . 



3. Leather refuse, — its value in agriculture (J. B. Lindsey). 



From preceding descriptions of experiments carried on 

 upon the fields of the station it will be noticed that our 

 attention has been turned of late to a special study of the 

 effect of different forms of nitrogen and potassium oxide 

 on the growth of a series of promhient fruit and garden 

 crops. The results of three years' observations regarding 

 the latter are already reported in detail upon preceding 

 pages (Field C). 



To explain the striking differences noticed in the yields of 

 some of those crops, in particular lettuce and tomatoes, when 

 raised with the assistance of either muriate or sulphate of 

 potash (upon Field C), it seemed advisable for confirmation 

 of the results to transfer the investigations to the vegetation 

 house, where, under better-defined circumstances, the special 

 efl'ects of the kind and form of the various articles of plant 

 food supplied, as well as the most suitable quantity of each 

 (nitrogen, potassium oxide and phosphoric acid), could be 

 more clearly demonstrated. General oljservations with fer- 

 tilizers in the vegetation house began four years ago. 



1. Observations with Different Forms of Potash, Phos- 

 phoric Acid and Nitrogen on Garden Crops. 



By C. a. Goessjianx. 



The first systematic attempt in the aljove-stated direction 

 was made during the winter of 1892-93. The soil used in 

 the vegetation house during that year was a sandy loam 

 taken a few feet below the surface from a locality which at 

 no time had received an additional supply of manurial mat- 

 ter from an outside source. It v/as sent through a screen 

 T)efore being used, to remove coarse vegetable matter (roots, 



