CONTENTS. 



Bulletin 170 — concluded. page 



Valuation of shade trees, ......... 255 



Court decisions concerning damages to trees, . . . . . 258 



Codified shade tree laws of Massachusetts, 1915, .... 261 



Bulletin 171. A chemical study of the asparagus plant, .... 265 



Introduction, ........... 265 



Crowns and roots, .......... 265 



Asparagus stalks, .......... 270 



Asparagus tops, .......... 272 



Progressive changes in composition of the asparagus plant, . . . 274 



The inorganic constituents of the asparagus plant, .... 275 



Effect of fertilizers on the composition of the asparagus plant, . . 276 



Effect of fertilizers on asparagus roots, ...... 277 



Effects of fertilizers on asparagus stalks, ...... 285 



Effects of fertilizers on asparagus tops, ...... 286 



Effect of fertilizers on asparagus roots at the end of the cutting season, . 289 



Reserve material required to produce a crop of young stalks, . . 290 



Amount of vegetable matter contained in ripened asparagus tops, . 292 



Relation of asparagus roots to weights of stalks, ..... 293 



Summary, ........... 295 



Practical conclusions from the chemical study of the asparagus plant, . 296 



Bulletin 172. Experiments in keeping asparagus after cutting, . . . 297 



