244 American Quarterly Microscopical Journal. 



before the female, he now goes on to show that the spores from the 

 fecundated oospheres fall to the bottom of the water and remain there 

 for some time. Cohn thought these spores required to be dried before 

 germinating. Cienkowski watched the division of the spore contents, 

 and believed that a coenobium was ultimately produced. About the 

 beginning of last June, however, Mr. Henneguy was able to follow the 

 developement of these spores, and now asserts that they pass the 

 winter in the water. Those which he studied had been preserved in 

 a tolerably deep vessel, in the Jardin des Platiles, constantly full of 

 water. 



The spores were orange-yellow in color, and possessed two envelop- 

 ing membranes, exospore, and endospore. At the moment of germina- 

 tion the exospore ruptures and the endospore escapes. The cell-contents, 

 separated from the wall by a clear space, divide into 2, 4, 6, 8 cellules, 

 and when this sub-division is complete the cellules form a spherical 

 layer analogous to the blastoderm of an holoblastic egg ; each element 

 acquires two cilia, the endospore disappears, and the young volvox is 

 set free. The cellules, at first very close together, separate by the 

 interposition of gelatinous matter. An interesting fact to notice is the 

 presence of elements larger than the others among the cellules within 

 the endospore. These finally give birth to daughter colonies, by a 

 mode of division similar to that observed in the spore. 



Lymphatic Hearts. — Prof. Ranvier.— Continued. 



Preliminary Note on the Intimate Structure of the Tongue 

 OF Parrots. — Prof. C. V. Ciaccio. 



Angular Aperture of Objectives.— Dr. Geo. E. Blackham— Con- 

 tinued. 



Studies on Foreign Microscopes.— Continued.— A description of 

 Bulloch's A B diatom stand. 



Organization and Nature of Hygrocrocis Arsenicus.— Dr. 

 Leon Marchand. — This fungus grows in the arsenical liquid well known 

 as Fowler's solution. Its growth is quite fully described and also 

 some points in its reproduction. It belongs to the Dematiei. 



Process for Arranging Diatoms Dry.— G. Marmod.— By expos- 

 ing a slide to the vapors of heated oil of cloves, numerous minute 

 drops are formed upon the surface, which will not evaporate for an 

 hour or two. By arranging the diatoms upon such a slide they will be 

 held securely in place after the liquid has entirely evaporated. 



Diatoms of the East Indian Archipelago.— Dr. P. T. Cleve.— 

 The full list of the species found in some collections, together with 

 descriptions of a few new species. First part, illustrated. 



The Thallus of Diatoms.— Dr. Matteo Lanzi.— Thallus, in this 

 connectioji, refers to the gelatinous stipes or ?niccus matricalis of 

 diatoms. It is produced by the accumulation of plasma within the 

 cells, which takes place to such an extent as to issue from the frustules. 



