310 INDEX. 



I. 



Ice formed, under peculiar circumstances, at the bottom of running water, 37. 



Iguanodorif memoir on a portion of the lower jaw of the, and on the remains of the Hylaeosaurus 

 and other Saurians, discovered in the strata of Tilgate Forest, in Sussex, 131. Portion of 

 the lower jaw of the Iguanodon, 131. Saurian vertebrae, 141. Hylaeosaurus, 141. Expla- 

 nation of the plates, 145. 



lulus terrestris, organs of reproduction of, 100. Structure of the ovum, 104. Deposition of the 

 ova and habits of the species, 106. Evolution of the embryo, 110. First period of develop- 

 ment, no. Second period. 111. Third period, 116. Fourth period, 121. Fifth period, 

 126. Sixth period, 128. 



lulus terrestris f organs of reproduction, in the male of, 100 ; in the female of, 102 ; structure of 

 the ovum in, 104; deposition of the ova, and habits of the species, 106; evolution of the 

 embryo, 110. 



L. 



Lee (Robert, M.D.). On the nervous ganglia of the uterus, 269. 



Lubbock (Sir J. W. Bart.). Note on an inequality in the height of the barometer, of which the 

 argument is the declination of the moon, 73. 



M. 



Machines, researches in the theory of, 285. Work, ibid. Modulus of a machine, 289. General 

 form of the modulus, ibid. The modulus of the pulley, 302. 



Magnetism, terrestrial, contributions to. No. IL, 11. §3. Captain Belcher's observations on 

 the west coast of America and the adjacent islands, 11. § 4. New determination of the mag- 

 netic elements at Otaheite, 29. 



Mantell (Gideon Algernon, Esq.). Memoir on the lower jaw of the Iguanodon, and on the 

 remains of the Hylaeosaurus and other Saurians, discovered in the strata of Tilgate Forest, 

 in Sussex, 131. 



. On the fossil remains of turtles, discovered in the chalk 



formation of the south-east of England, 153. 



Modulus, of a machine, 289. General form of, ibid. ; of the pulley, 302. 



Moseley (The Rev. Henry). Researches in the theory of machines, 285. 



Mucus-globules, compared with corpuscles of the blood, 219. 



Muscle, voluntary, additional note on the contraction of, in the living body, 69. 1. The contrac- 

 tion of a muscle is the essential cause of its own rupture, 70. 2. There is no repellent force 

 between the contractile elements of muscular fibre, 71. 



Muscular tissue, the elements of, compared with corpuscles of the blood, 235. 



Myriapoda, on the organs of reproduction, and the development of the, 99. 1. Organs of repro- 

 duction in the lulus terrestris, 100. 2. Structure of the ovum, 104. 3. Deposition of the 

 ova, and habits of the species, 106. 4. Evolution of the embryo, 1 10. First period of de- 

 velopment, 110. Second period. 111. Third period, 1 16. Fourth period, 121. Fifth pe- 

 riod, 126. Sixth period, 128. Recapitulation and conclusions, 128. 



N. 

 Nails, the, one of a class of non-vascular animal tissues, 185. 



