EXTRACTS AND ABSTRACTS FROM FOREIGN JOURNALS. 241 



corrosive sublimate. Spirals from the leaf-stalk of the strawberry, 

 after the addition of this reagent, were seen to have divided into parallel 

 filaments having the same structure as those above described. Flax 

 presented a quadruple coil of such filaments. In early states of volun- 

 tary muscle also, there were seen double and quadruple coils, evidently 

 produced by the same means division. Dr. Barry compares the ap- 

 pearance of the vegetable " dotted duct," in its several stages, with that 

 of objects found in mould, in the cornea, in the crystalline lens, and in 

 voluntary muscle, all of which are produced by associations of minute 

 spiral threads. The distribution of the remarkable filaments above des- 

 cribed is so universal, that they are found in silk, in the incipient fea- 

 ther, in hair, in the feather-like objects from the wing of the butterfly 

 and gnat, and in the spider's web. 



Dr. Barry informs us that he has had the opportunity of showing to 

 several physiologists the principal appearances described in his memoir 

 on fibre. And Professor Owen permits him to state, that he has exhi- 

 bited to him spirals in voluntary muscle, muscular " fibrillse," having 

 a flat, grooved, and compound form, the filamentous structure of 

 "white substance in nervous fibre," the vegetable spiral becoming 

 double by division, a coiled filament within red blood- discs, and the 

 incipient unwinding of the coil in coagulating blood. 



<rtract$ an* 3fostract3 from 



[From Mullers Archives, 1842.] 



Dr. Vogt makes some observations upon the young of a Filaria 

 which he found in the blood-vessels of a frog in large numbers, and con- 

 cludes, from his own and Valentin's observations, that these entozoa 

 are deposited by the parent in the space between the liver and pericar- 

 dium, whence they insinuate themselves into the larger blood-vessels, 

 and circulate with the blood for some time, and are finally deposited 

 on the surface of the intestines. In this situation they become, as it 

 were, imbedded, and cysts of effused fibrine are formed around them, in 

 consequence of the inflammation excited by their presence. In these 

 cysts they live and grow, until they become mature, when they emerge 

 from them to deposit their young, which run through the same course. 



Herman Meyer on the Structure of the Horny Integument of Coleopte- 

 rous Insects. These researches were made in all parts of the horny case of 

 the Lucanus Cervus. In the natural condition, the substance of this tissue 

 is so hard and brittle, that it is impossible to procure thin slices of it for 



VOL. II. R 



