PROGRESS OF MICROSCOPICAL SCIENCE. 233 



Dujardin, on the basis of observation of the habits of the living animal 

 and of microscopic examination of the matters ejected from the 

 vent. 



" These statements are entirely borne out by my own careful ob- 

 servation of the actions of the brachial and tentacular apparatus, alike 

 in the Pentacrinoid and in the adult condition, and by the microscopic 

 examination I have repeatedly made of the contents of the alimentary 

 canal. These consist of minute Entomostraca, diatoms, spores of 

 algfB, &c., but especially, in my Lamlash specimens, of Peridinium 

 tripos (Ehr.), which was usually very abundant in that locality. A 

 powerful indraught current towards the mouth is maintained by the 

 action of the large cilia that fringe the villous folds of the alimentary 

 canal ; but this does not extend to any considerable distance ; and it is 

 clear that minute particles are transmitted from the peripheral ex- 

 tremities of the arms and pinnules, along the brachial furrows and the 

 radial furrows of the disk, to the neighbourhood of the mouth, where 

 they come within the reach of the oral indraught. This I have re- 

 peatedly seen when I have had young Pentacrinoids alive under the 

 microscope : and although I have been prevented, by the peculiarity 

 of their position, from detecting the cilia to which the transujission is 

 attributable, I can scarcely doubt that they belong to the epithelial 

 floor of the furrows. And when I have detached small pieces of the 

 soft parts from the arms of the living adult, I have found currents to 

 be produced in the water surrounding them, which could only be 

 accounted for by ciliary action. Thus the brachial apparatus may be 

 regarded, in the first place, as an extended food-trap." 



Blood-glohules in Typhoid Fever. — M. Cornil has found, in the 

 blood of the spleen of patients who have died in the third week of 

 typhoid fever, large numbers of white globules, enclosing red globules 

 to the number of five, six, or even more in a single cell. Other cells 

 enclosed granules of haematosine. Although the existence in the blood 

 of these large cells containing red globules is nothing new, neverthe- 

 less Cornil is the first to insist upon their multiplication in typhoid 

 fever. The mesenteric glands, according to Cornil, are always in- 

 flamed in typhoid fever, in a manner analogous to the acute or sub- 

 acute inflammation due to suppurative lymphangitis. 



Course of tlie Fibres in the Spinal Chord. — Dr. Schieffendecker gives 

 the following summary in Schultze's ' Archiv,' Band x. Heft 4 : 



I. Fibres passing out in difierent directions from the white sub- 

 stance into the grey regions. 



A. Fibres, which originate at the same point, and pass over into 

 the grey substance at different heights. " . 



B. Fibres, which originate at different points of the white sub- 

 stance, and pass over, at the same point, into the grey substance. 



C. Fibres, which belong to the same vertically extending bimdles, 

 and which, at the same height, bend over to the grey substance, often 

 divide during their horizontal course in the white substance, towards 

 the right and left, terminating in the grey substance, as bundles of 

 different character. 



