XI. INSTRUCTION. 995 



the botanical composition of the herbage on 12 selected plots, in the 17th 

 season of the experiments, 1872 ; and the quantities represent the relative 

 proportion by weight in which each species was found in the mixed produce 

 of the plots. 



The mean produce of hay per acre per annum has ranged on the different 

 plots from about 23 cwts. without manure, to about 64 cwts. on the plot the 

 most heavily manured. 



The number of species found has generally been about 50 on the uii- 

 manured plots, and has been reduced to an average of only 20, and has 

 sometimes been less, on the most heavily manured plots. 



Species belonging to the order Graminacece have, on the average, con- 

 tributed about 67 per cent, of the weight of the mixed herbage grown without 

 manure, about 65 per cent, of that grown by purely mineral manures (that is, 

 without nitrogen), and about 94 per cent, of that grown by the same mineral 

 manures with a large quantity of ajnmonia-salts in addition. 



Species of the order Leguminosce have, .on the average, contributed about 

 8 per cent, of the produce without manure, about 20 per cent, of that with 

 purely mineral manures, and less than OJ per cent, of that with the mixture 

 of the mineral manures and a large, quantity of ammonia-salts. 



Species belonging to various other orders have, on the average, contributed 

 about 25 per cent, of the produce without manure, about 15 per cent, of that 

 with purely mineral manures, and only about 6 per cent, of that with the 

 mixture of the mineral manures and a large amount of ammonia-salts. 



Not only the amount of produce, but the number and description of species 

 developed, have varied very greatly between the extremes here quoted, 

 according to the particular character or combination of manure employed, as 

 is strikingly illustrated by the arrangement of the specimens in the case. 



391Oa. Photographs under glass, for demonstrating the con- 

 sequences of exterior damages to trees, the influence of cold on 

 trees, and modes of protection of trees. 



Royal Botanical Garden and Museum of the University at 

 Breslau (Prof. Dr. H. R. Goppert). 



3911. E. J. Spitta's working Model of the larynx. 



T. Hawhsley. 



3912. 106 Original Water-Colour Drawings, by Wolf, 

 illustrating the new and rare animals exhibited in the Society's 

 Gardens. .. The Zoological Society of London. 



(Uprights.) 



1. Orang-Outang - Simia satyrus. 



2. Chimpanzee - - - Troglodytes niger. 



3. Hoolock Gibbon - - Hylobates hoolock. 



(Longs.; 



4. Ashy-black Ape - - Macacus ocreatus. 



5. Black-fronted Lemur - - Lemur nigrifrons. 



6. Lioness and Young - - - _ Felis leo. 



7. Painted Ocelot - - Felis picta. 



8. Ocelot - - Felis pardalis. 



9. Ocelot - - Felis pardalis. 

 10". Egyptian Cat - - - Felis chaus. 



3 R a 

 - 



