( a ) 



SuMMABY OF CuBRENT Rbseabohes, &c. — Continued. 



FAGB 



Observations on the Echhioidea 744 



Crossaster .. 745 



Origin of the Ovum of the Hydroida 746 



American Acalephm . . . . . . 746 



Jelly-fishes of Narragansett Bay 746 



^quorea Forsltalea 747 



Notes on Limnocodium 747 



Medusse and Rydroid Polyps Living in Fresh Water 748 



Propagation of Sponge by Cuttings 748 



Organism which penetrates and excavates Siliceous 8pon^e-8picula ,. .. 751 



Stricture of Unicellular Animals in General .. .. .. ,.' ., ., ,. 751 



New Infusoria (Plate X.) 756 



The Tintinnodea .. .. ., , 756 



' Betioulariati Bhizopoda .. 759 



Protozoa Parasitic in Man and the Diseases to which they give rise . . . . 760 



Parasitic Protozoa, especially those of Man ..' 764 



Psorosperms of Fishes .. 766 



ButschWs' Protozoa' .. ., .. 766 



... Botany. 



Development of the Embryo of Grasses .. 767 



Collenchyma . . .. .. 768 



Chemical Nature of the CeU-nucleus .. . . . . 769 



Metastasis in the Vegetable Organism . . 770 



• Hydrostatic Tension as a Cause of Movements of the Sap and of various 



Organs .. .... .. .. .. 771 



Potdsen's Botanical Micro-Chemistry 772 



HybridMoss .. .. ,. .. 772 



European Sphagnaceie .. . . . . . . 773 



Genevan Characeie .. .. .. .. .. 774 



American Gymnosporangia or " Cedar-apples " . . . . 774 



Cancer of Apple Trees .. . . .... . . 775 



Peziza Fuckeliana and Sclerotiorum .. .. .. .. 775 



Puccinia Lojkcgana .. .. .... .. 777 



Septoria Castanese, the Chestnut-disease 777 



Bacteria living at High Temperatures 778 



Bacteria in Diphtheria .. .. , .. .. 779 



Fatal Form of Septicsemia in the Babbit, produced by the Subcutaneous 



Injection of Human Saliva 779 



Afition of Compounds Inimical to Bacterial Life 781 



Action of Ozone on Germs contained in the Air 781 



Marine Algas of New England . . 782 



North American Algse . . 782 



Abnormal Fructification in the Floridese 782 



Congenital Union of growth on the Thattus of the Pollexfeniese 783 



Structure of Terpsinoe . . .. .. .. .. .. •• 783 



Bemarkable Vital Phenomenon in the Adriatic .. .-. 785 



Uses of Diatoms . . 785 



Striie of the Diatomaeeie 787 



Endophytic Algse .. 801 



MiCEOSOOPY. 



Beck's " Ideal" Mia-oscope (Fig. 166) 805 



Cosson's" Dissecting" and "Observing" Microscope (Fig. 167) 807 



Holmes's Clo^s Microscope (Fig. 168) .. •• 808 



Pocket Microscope (Figs. 169 SLud no) 809 



Swift's ^^ Challenge" Binocular Microscope (C) (Fig. Ill) 810 



Verick's "■ Goniometrical Microscope for Mineralogy " (Figs. 172-174) .. 812 



Seibert and Kraft's Dissecting Microscope (Figs. 175-177) .. 814 



The Battle of the Stands 815 



Fine Adjustment by the Eye-piece XFig. 178) .. .. 816 



Zeiss's Camera Lucida with Two Prisms (Figs. 179 and 180) 818 



Silver Films for Instruments of the Camera Lucida Class (Figs. 181-183) 819 



Apparatus for Examining Different Spectra 822 



Sorby's Binocular Spectroscope (Figa. 18i and 185) 822 



