72 



273. A collection of botanical specimens prepared by 

 the late Professor Henslow. 



E. 4 to 12. 1869. Given by W. J. Stewart. 



274. Collection of specimens of the fruits of 128 

 different species of plants for the use of botanical stu- 

 dents. 



E. 96. 1857. Prepared by the late Professor Henslow. 



Many are shown in longitudinal or transverse section, or have 

 been opened in some other way to show their internal arrange- 

 ments. 



275. Sections of a hundred kinds of wood, embracing 

 the forest and garden species, as well as the commonest 

 forest shrubs of Germany. Prepared by Dr. H. 

 Nordlinger. In two book boxes with introductions to 

 the mode of classification. 



E. 1. 1867. Given by the late Sir C. W. Dilke, Bart. 



276. Specimens of twenty-four kinds of natural and 

 artificial grasses and their seeds. In glass tubes, with 

 stoppers to contain the seeds. 



E. 9. 1883. Given by Messrs. Button fy Sons. 



277. Case of specimens, illustrating the domination of 

 one plant over another in the mixed herbage of grass 

 land, under the influence of different manures, each 

 applied year after year on the same plot. 



Lent by Sir John Bennet Lawes, Bart. 1876. 



The experiments were made in Mr. Lawes' park, at Rotham- 

 sted, near St. Albans, commencing in 1856, at which time the 

 character of the herbage was apparently pretty uniform over all 

 the plots, and there were 50 species or more growing together. 

 There are about 20 experimental plots, from a quarter to half 

 an acre each ; two being left continuously without manure, and 

 each of the others receiving its own special manure year after 

 year. Under this varied treatment, changes in the flora, so to 

 speak, became apparent even in the first years of the experi- 

 ments ; and three times since their commencement, at intervals 

 of five years namely, in 1862, 1867, and 1872 a carefully 

 averaged sample of the produce of each plot has been taken and 

 submitted to careful botanical separation, and the per-centage 

 by weight of each species in the mixed herbage determined. 

 Partial separations have also been made in other years. The 

 specimens exhibited in the case show the botanical composition 

 of the herbage 011 12 selected plots, in the 17th season of the 



