VI CONTENTS. 



PAGE 



XVII.— Note on Mr. Wcnham's Paper " On the Measurement of 

 the Angle of Aperture of Objectives." By Professor 

 K.Keith No. 3 270 



XVIII.— Keply to the foregoing Note. By F. H. Weuliam, 



F.R.M.S „ 271 



XIX. — On the Development and Eetrogression of the Fat-cell. 

 By George Hoggan, M.B., and Frances Elizabeth 

 Hoggan, M.D. (Plates XIII. and XIV. and 1 tig.) .. No. 4 353 



XX. — On some Applications of Osmic Acid to Microscopic 



Purposes. By T. Jeffery Parker, B.Sc, F.R.M.S. .. „ 381 



XXI. — Is not the Rotiferous Genus Pedalion of Hudson syno- 

 nymous with Hexarthra of Ludwig Schmarda? By 

 JulienDeby, F.R.M.S „ 384 



XXIL— Note'on M. Deby's Paper. By 0. T. Hudson, LL.D., 



V.P.R.M.S. (2 figs.) „ 386 



XXIII. — An Illuminating Traverse-Lens. By Robert B. Tolles, of 



Boston, Mass., U.S. (1 fig.) „ 388 



XXIV. — On the Occurrence of Recent Heteropora. By Arthur 



Wra. Waters, F.G.S. (Plate XV.) „ 390 



XXV. — Note on Homogeneous Immersion Object-glasses. By 



F. H. Wenham, F.R.M.S „ 394 



XXVI. — On a New Species of Excavating Sponge (Alectona Mil- 

 Ian) • and on a New Species of Hhaphidotheca (i?. 

 affinis). By H. J. Carter, F.R.S., &c. (Plates XVII. 



andXVIIa., Figs. 1-4) No. 5 493 



XXVII. — On a New Genus of Foraminifera (Aphrosina informis); 



and Spieulation of an unknown Sponge. By H. J. 



Carter, F.R.S., &c. (Plate XVIIa., Figs. 5-12) .. „ 500 



XXVIII. — On the Theory of Illuminating Apparatus employed with 



the Microscope. Part I. By Dr. H. E. Fripp, Ex.-Off. 



F.R.M.S. (9 figs.) „ 503 



XXIX. — Observations on Notommata Wcrneckii, and its Para- 

 sitism in the Tubes of Vaucheria. By Professor Bal- 



biani. (Plate XVIII.) „ 530 



XXX. — On a New Species of Cothumia. By John Davis, 



F.R.M.S. (Plate XX.) No. 6 653 



XXXI. — On some Causes of Brownian Movements. By William 



M. Ord, M.D. Lond., F.R.M.S., &c. (2 figs.) .... „ 656 

 XXXII. — Observations suggested by the Study of Amphipleura 

 pellucida, mounted in Canada Balsam, by Lamplight 

 and Sunlight, with various Objectives. By J. J. 

 Woodward, Surgeon and Brevet Lieutenant- Colonel 



U.S. Army, Hon. F.R.M.S , 663 



XXXIII. — Note on Abbe's Experiment on Pleurosigma angulaium. 

 By J. J. Woodward, Surgeon and Brevet Lieutenant- 

 Colonel U.S. Army, Hon. F.R.M.S. , 675 



