MILK-VESSELS. 



[ 427 ] 



MNLlCEiE. 



Dr. Peddie's paper on the human milk in 

 relation to medical practice, is well worthy 

 of perusal. 



BiBL. KoWiker, MikrosJc.Anat. ii.; Donne, 

 Cours de Microscojne ; Wagner, Handwor- 

 terb. d. Physiologie, art. Milch; Peddie, Ed. 

 Monthly Journ. 1840, and the Bibl. of Che- 

 mistry, Animal. 



MILK- VESSELS. See Laticiferous 



TISSUE. 



MILLON'S TEST, or Test-liquid.— 

 This, a strongly acid (nitric and nitrous) 

 solution of proto- and pernitrate of mercury, 

 gives an indication of the presence of proteine 

 or allied compounds by the production of a 

 more or less deep rose-red colour. 



The test-liquid is prepared by dissolving 

 metallic mercury in an equal weight of strong 

 nitric acid (sp. gr. 1'4). The acid is first 

 poured upon the metal j gas is copiously 

 evolved, and as soon as the evolution ceases, 

 a gentle heat is aj)plied until the whole of 

 the metal is dissolved. After some hours, 

 the liquid portion is poured off from the 

 crystals which have formed and subsided, 

 and must be kept in a stoppered bottle. 



In use, the substance to be tested is im- 

 mersed in the liquid, either in a tube or 

 upon a slide with a cover, and heat applied 

 over a small flame of a spirit-lamp until 

 boiling occurs. The substance then appears 

 of a red colour if it answers to the action of 

 the test. 



Great attention is required to the purity 

 of the substance or body to be tested, other- 

 wise, e. g., a cell-wall might appear to be 

 coloured from the contents consisting of a 

 proteine compound, &c. 



The following substances and tissues are 

 coloured by the reagent : albumen, caseine, 

 chondrine, crystalline, epidermis, feathers, 

 fibrine, gelatine, gluten, horn, legumine, 

 proteine, silk, wool. 



The following, when pure, are not coloured : 

 cellulose, chitine, cotton, gum (arable), linen 

 and starch. 



Bibl. Millon, Comptes Rendus, 1849, or 

 Chem. Gaz. 1849. vii. p. 87- 



MILNESIUM, Doyere. — A genus of 

 Arachuida, of the order Colopoda, and family 

 Tardigrada. 



Char. Head with two very short palpiform 

 appendages at its anterior and lateral part ; 

 mouth terminated by a sucker surrounded 

 by palps ; skin soft, transversely furrowed ; 

 legs four pairs; rings of the body divided 

 into two segments. 



M. tardigradum (pi. 41. fig. 9). Mouth 



surrounded by six minute unequal palps, 

 symmetrically arranged, diminishing in size 

 from the upper to the lower part; head 

 rounded in front when the mouth is retracted; 

 eye-spots tolerably large and granular; pha- 

 ryngeal tube much dilated, styles very small, 

 bulb elongated and pyriform, without an 

 internal framework; body transparent, at- 

 tenuated at both ends, especially the poste- 

 rior ; skin pale brownish-yellow ; three an- 

 terior pairs of legs nearly equal, the fourth 

 very short, resembling two tubercles, with 

 scarcely a trace of annuliform division; 

 claws four, two terminal, and in the form of 

 elongated filaments hooked at the end, and 

 each supported on a distinct tubercle ; two 

 inferior and internal, the anterior divided 

 into three strongly curved hooks, the poste- 

 rior into two; hooks or terminal filaments of 

 the fourth pair longer than those of the three 

 first. Movement active. Length 1-50 to 1-40". 



Bibl. Dovere, Ann. des Sc. nat. 



MIRROR"^ OF SOEMMERING. See 

 Introduction, p. xiv. 



MISLETOE. See Viscum. 



MITES. — The animals usually included 

 under this indefinite term are species of 

 genera belonging to the family Acarina 

 among the Arachnida. 



MNIACEiE. — A tribe of Mnioidete 

 (Mosses), of Bryoid habit, but with firm, 

 rigid, and usually undulated leaves, mostly 

 increasing in size toward the summit of the 

 stem. 



British Genera. 



I. CiNCLiDiuM. Calyptra conical, dimi- 

 diate, small, fugaceous. Peristome double, 

 the external sixteen, short and truncate ; 

 the internal composed of a cup-like mem- 

 brane with sixteen folds, and sixteen fora- 

 mina opposite the outer teeth, open at the 

 summit. 



II. Mnium. Calyptra as in Cinclidium. 

 Peristome double ; exterior of sixteen lan- 

 ceolate, cuspidate teeth, trabeculate exter- 

 nally and with a longitudinal line, lamellar, 

 fleshy inside, yellowish ; interior a membrane 

 with keeled folds, produced into sixteen 

 lanceolate, broad, keeled teeth, with large 

 perforations, connivent like a cupola, sur- 

 passing the outer teeth, with 2-4 intervening 

 cilia. 



III. Georgia. Calyptra mitriform, 

 plaited. Peristome simple, of four pyramidal 

 cellular teeth. 



IV. TiMMiA. Calyptra dimidiate-hood- 

 shaped, very fugaceous. Peristome double : 



