PROGRESS OF MICROSCOPICAL SCIENCE. 73 



being respectively present in the cases recorded, and being visible as 

 " a white undulating mass," is viviparous, the larva being seen at birth 

 to protrude from the abdomen of the fly, and move its head as if in 

 search of some point of attachment ; and, should a piece of meat be 

 presented to it, " the mandibles are driven into it, and the larva with- 

 draws itself from the body of the mother, and is immediately followed 

 by another and another, until several have been delivered." The 

 intense deep-seated pain and the streaks of blood which accompanied 

 the purulent discharge were easily accounted for when a larva was ex- 

 amined under the microscope, after being included between the bottom 

 of a glass beaker and a piece of meat ; the animal being seen to be 

 armed with a pair of strong mandibular hooks, articulated with a kind 

 of chitinous endo-skeleton lying within the anterior rings of the body. 

 When the larva strikes its prey, the integument of the rings is made 

 tense, the mandibles being thereby extended and fixed firmly in that posi- 

 tion on the framework ; the anterior rings are then retracted as a whole, 

 " and thrust quickly forwards with a force often sufficient to bury the 

 claws up to their roots." This manoeuvre is rapidly repeated, while the 

 body is simultaneously dilated, the sharp backwardly-directed papilla? 

 which clothe it giving it an additional hold. " We can hardly, then," 

 says the ' Lancet,' " be surprised that these pests cannot be dislodged 

 merely by the process of syringing, but that they must be picked out 

 singly with a forceps, and that after their removal the intense pain 

 ceases and the blood-streaks in the discharge disappear." 



The Anatomy of the Cerebellum. — One of the best articles that have 

 ever appeared on this subject is one which is given * in the ' British 

 Medical Journal' for November 30, 1872. We congratulate the 

 ' Journal ' on its appearance, as we hope that this article is but one 

 of a series which the editor proposes to give. It states that, accord- 

 ing to M. Luys, the apparatus of cerebellar innervation constitutes 

 a subsystem clearly isolated, in spite of its close connection, on the 

 one hand, with the cerebral system properly so-called, and, on the 

 other, with the spinal system. It is a true central apparatus, engen- 

 dering and distributing the cerebellar influence by a special conductive 

 system to an apparatus of peripheral reception. He compares this 

 disposition to that of the circulating system. The cerebellum repre- 

 sents the heart as the central apparatus ; the peduncles which emerge 

 from it are the analogues of the arteries ; and, finally, the capillary 

 network of arteries can alone give an idea of the diffusion of the 

 plexuses of grey peripheral matter, in which the terminations of the 

 peduncular fibres are lost. The disposition of the cerebellar hemi- 

 spheres recalls and reproduces that of the cerebral hemispheres. 

 From the periphery of the cerebellum (cerebellar convolutions) start 

 converging fibres, which terminate in a grey central nucleus (rhom- 

 boidal body of the cerebellum). From this nucleus spring three 

 bundles of efferent fibres, constituting the superior, middle, and 

 inferior cerebellar peduncles. These peduncles all pass forwards and 

 mingle with the elements of the nervous system, which appear to have 



* It is No. II. in order. 



