EXTRACTS AND ABSTRACTS FROM FOREIGN JOURNALS. 85 



from which the barky covering of the radicles is formed. This layer 

 fills the base of the deep indenting furrow. In the cells of the dead 

 layer, the amylum disappears, and a brown colour is produced. The 

 small central woody system is composed of short, roundish, spiral, and 

 annular cells with larger intercellular spaces and passages, amongst 

 which only a few plain cells, having thin walls, are distributed. The 

 radiating vascular bundles consist of delicate annular and spiral vessels, 

 and a few elongated cells having delicate walls ; at the junction of 

 them with the woody system, the vessels become shortly articulated. 



On Entozoa and Parasites. (Reference to the following, p. 239, et seq. 

 Valentin's Repertorium, 1841.) Nivet on Cysticerci. Hdring on a case 

 of Cysticercus cellulosa in the conjunctiva of a girl seven years of age. 

 Michea on two cases of Acephalocysts in the brain. Cruiveilhier on Ace- 

 phalocysts of the liver, and especially of the spleen. Weitenkampf on 

 the passage of Blasenschwanzen (?) with the urine. Wymann on Filaria 

 in the bronchi of a sheep. Lee on Filaria papillosa in the anterior 

 chamber of the eye of the horse. Mailer on Distoma in the hol- 

 low of the spinal marrow of the Foetus. Mtesson on a worm found in 

 the bubo of a woman thirty- six years of age. Skripitzin on Pulexpene- 

 trans. Brunzlow on the Acarus of the Itch. 



Will on the Compound Eyes of Insects and Crustacea. (Continued from 

 page 185, Vol. 7.) Behind the cornea is a layer of minute conical or 

 pyramidal- shaped crystalline bodies, one of which is placed behind each 

 corneal facet, in such a direction that its acuminated extremity points 

 to the interior of the eye. Connected with this extremity is a nervous 

 fibril given off by the optic ganglia, which spreads itself out in a cup- 

 shaped manner, surrounds the whole of the crystalline body, with the 

 exception of its base, and then either immediately passes to the edges 

 of the facets of the cornea, or to a thin membrane between the crystal- 

 line bodies and the cornea. A great deal of pigment is found between 

 the crystalline bodies, especially near their points. No trachea could 

 be discovered in the layer of pigment. Amongst the Crustacea, Paleemon 

 serratus has four-cornered facets and crystalline bodies. The latter, 

 when pressed, divide longitudinally into four portions, the places of 

 separation being indicated in the perfect bodies by the presence of lon- 

 gitudinal lines. Between the cornea and the convex bases of the crys- 

 talline bodies, is a transparent layer, provided with pigment, and of the 

 thickness of y^j-oth to -fotin. of a line. This layer can easily be separated 

 from the bodies just alluded to, and behind which latter is a soft cylin- 

 drical mass of about half their length, which envelopes their posterior 

 quarter in a cup-like manner. The whole mass is very thickly studded 

 with dark pigment. To each crystalline body runs a cylindrical cord, 

 given off by the ganglia of the optic nerves, and which consists of a 

 tube enveloped in a sheath to the point where this cord separates from 

 the ganglion ; the sheath is constricted and surrounded with a great 

 quantity of pigment. From the transparent masses behind the crys- 

 talline bodies, a bason-shaped expansion arises, which reaches anteri- 



