JOURNAL 



OP THE 



ROYAL MICEOSCOPICAL SOCIETY. 



VOL. II. No. 7. 



CONTENTS. 



Pbepaoe. 



Tkansactions op the Society — paob 



XXXV. On the Morphology op Vegetable Tissues. By 

 W. H. Gilburt, F.R.M.S. (Plates XXII. and 



XXIII.) 801 



XXXVI. Note on the Structure op the Scale op a Species 



OP THE Genus Mormo. By Joseph Beck, F.R.M.S. 810 

 XXXVII. On New Methods for Improving Spherical Correc- 

 tion, APPLIED TO the CONSTRUCTION OP WlDE- 



angled Object-glasses. By Professor E. Abbe, of 



Jena, Hon. F.Ii.M.S 812 



XXXVIII. On the Anatomy op Leptodora hyalina. By H. E. 



Forrest. (Plates XXIV. and XXV.) .. .. 825 



XXXIX. On a New Species op the Genus Eucampia. By 



Henry Stolterfoth, M.D 835 



XL. Immersion Stage Illuminator. By Jobn Mayall, Jun., 



F.E.M.S 837 



XLI. On a Table op Numerical-Apertures, showing the 

 Equivalent Angles op Aperture op Dry, Water 

 Immersion, and Homogeneous Immersion Objec- 

 tives, WITH their respective Eesolving Powers, 

 taking the Wave Length of Line E as the 

 Basis ; a = n sin. w, n = refractive index, and 

 w = ^ angle of aperture. By J. W. Stephenson, 



F.R.A.S., Treas. R.M.S 839 



XLII. Aperture Measurements of Immersion Objectives 

 expressed as "Numerical Aperture." By John 

 Mayall, Jun., F.E.M.S 842 



Record of Current Researches relating to Invertebbata, 



Cryptogamia, Microscopy, &c. .. .. .. .. .. 844 



Zoology. 



Gestation of the Armadillo 844 



Vitality of the Spermatozoa of the Trout 844 



Experiments on Development ,. • •• 844 



Granular Bodiea found in the Ovum 845 



