XI. INSTRUCTION. 837 



39O4c. Series of Fifteen Dissections, illustrating the 

 anatomy of the edible Frog (Rana esculenta). 



Prof. Huxley, F.R.S. 



3904d. Series of Sixteen Diagrams, illustrating the 

 anatomy of the Frog. Prof. Huxley, F.R.S. 



3904e. The Exoskeleton of the Common Lobster, dis- 

 articulated and mounted. Prof. Huxley, F.R.S. 



3905. Botanical Class Diagrams, used by the Professor of 

 Botany, Royal College of Science. Diagrams of Clasterium and 

 Euastrum; also of Cycas circiualis, illustrating drawings used in 

 the botanical class in the Royal College of Science. 



JV. R. M'Nab, M.D. 



3906. Models of Monocotyledonous Embryos (8), pre- 

 pared by Dr. Ziegler, of Freiburg, in Breisgau, part of a set of 

 wax models used in the botanical class in the Royal College of 

 Science. W. R. M'Nab, M.D. 



3907. Models of the flowers of Monocotyledonous and Dico- 

 tyledonous plants ; part of a set of models prepared by Robert 

 Brendel, in Breslau, used in the botanical class in the Royal 

 College of Science. IV. R. M'Nab, M.D. 



3908. Diagram of the My xastrum Radians, a non -nucleated 

 Protozoon feeding on Diatoms. 



Professor A. Leith Adams, F.R.S. 



3909. Diagrams of the Eucecryphalus Schulzei and Helios- 

 phera Inermis. Professor A. Leith Adams, F.R.S. 



The above are two forms of ladiolaria, showing their siliceous skeletons, 

 and the celloform bodies of a bright yellow colour, containing starch. The 

 nucleus and pseudopodia with granules are also represented. 



30 1O. 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. John Bennet Lawes. 



The experiments were made in Mr. Lawes' park, at Rothamsted, 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 experiments ; 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 



