INDEX. 



1047 



Marshall (J.) on the development and 

 varieties of the great anterior veins in 

 man and mammalia, 842. 



Marsupialia, structure of the dental 

 tissues of, 847 ; teeth of, distinct from 

 those of other mammals ; dentinal tuhes 

 continued into the enamel ; the enamel 

 pulp developed into tuhes instead of 

 sohd fibres ; the enamel and dentine 

 modifications of each other, 848. 



Matter, magnetic condition of, 593. 



Matteucci (C), Copley medal awarded 

 to, 522. 



— — , electro-physiological researches, 



memoir 1, 555. 

 on the physiological action of the 



electric current, 4th memoir, 629. 

 , electro-physiological researches, 



5th, 6th, and 7th series, 678. 

 , experiment on the influence of 



magnetism on polarized light, 741. 

 , electro-physiological researches, 



7th series, 902. 

 , electro-physiological researches, 



9th series, 966. 

 Maunoir (Prof.) on the musculaiity of the 



iris, 607. 



M'Ginn (T.), an account of a remarkable 

 am'ora borealis, seen at ^Montreal on 

 the 13th of August 1849, 911. 



Media, physics of, a new theory of heat, 

 604. 



Medicines, influence of, on the acidity of 

 the urine, 825. 



Medusae, anatomy and affinities of, 832 ; 

 organs found of two distinct mem- 

 branes ; differences of the inner and 

 outer membranes, and in different spe- 

 cies, digestive system of; generative 

 organs placed between the two mem- 

 branes ; no indubitable trace of a ner- 

 vous, or "blood vascular" system, 834 ; 

 homologies of, 835. 



Meeting, special general, concerning the 

 award of the roval medal in 1845, 

 664*. 



Meetings for the election of Fellows, 

 June 9, 1848, 761 ; June 7, 1849, 827 ; 

 June 6, 1850, 954. 



Membrana tympani, structm'e of, in the 

 human ear, 968 ; composed of three 

 layers ; functions of the fibrous laminae, 

 cu-cular and radiating; non-muscularity 

 of the fibres ; description of the tensor 

 tympani ligament, 969. 



Membranes, synovial, structure of, 621. 



Metallic salts, experiments vdth on the 

 evolution of heat, 732. 



Metals, magnetic condition of, 593. 



, emit sounds under influence of elec- 

 tro-magnets, 660. 



Metals, phenomena and motions of, under 

 influence of magnetic force, 855 ; be- 

 come magnetic or diamagnetic in pro- 

 portion to electro-magnetic power; 

 variations of the movement of re- 

 vulsion in ; transverse movement of 

 between the poles, changed from 

 magnetic to diamagnetic state, due to 

 thi-ee different conditions of molecular 

 aiTangement, 856. 



Meteorological observations, corrections 

 necessary to deduce monthly means 

 from ; mean values of, how deduced, 

 743. 



in India, discussion of, 933 ; 



ebb and flow of the atmosphere ; re- 

 trograde movements, maximum pres- 

 sure of in coldest months ; minimum 

 pressure not in the hottest months, 

 934; great differences in fall of rain 

 within limited areas ; influence and di- 

 rection of winds, 935. 



Meteors, seen during the appearance of 

 am-ora borealis, 791. 



IMice, experiment on their food, 560. 



Milan, magnetic observations at, 475, 

 542. 



MiUer (J. F.) on the meteorology of the 

 Lake district of Cumberland and West- 

 moreland, 757, 816, 952; remarks on 

 Mr. Homersham's paper, 794. 



, some remarks on a paper, entitled 



" On the depth of rain," &c., 794. 



on the meteorology of the Lake 



district of Cumberland and Westmore- 

 land, with a continuation of the re- 

 sults of experunents on the fall of rain 

 at various heights, up to 3166 above 

 the sea level, 952. 



on the relation of the au" and eva- 

 poration temperatm-es to the tempera- 

 ture of the dew-point, as determined 

 by Mr. Glaisher's hygrometrical tables, 

 &c., 953. 



Moist-bulb problem ; depressions of, exa- 

 mined and compared, 740. 



Molecular constitution of volatile organic 

 bases, researches on, 904 ; equivalents 

 of ammonia replaced by equivalents 

 of compound radicals ; modification of 

 basic chai-acter by introduction of ra- 

 dicals ; means of indefinitely increasing 

 the number of alkaloids ; formulas de- 

 noting the changes in ammonia ; pro- 

 duction, duphcation and triplication of 

 ethylamine, 905, 906. 



phenomena produced by electro- 

 magnetic action, 661. 



Mollities ossium, a case, during which a 

 new substance occun-ed in the urine, 

 673. 



