CONTENTS 
TRANSACTIONS OF THE SOCIETY. 
PAGE 
X. — On a New Apochromatic Objective constructed without 
the Use of Fluorite. By Philip E. Bertrand Jourdain, 
F.R.M.S. (Figs. 72 and 73) 395 
XI. — On a Method of Adjusting the Sizes of the Coloured 
Images yielded by the Cooke Lens. By Philip E. 
Bertrand Jourdain, F.R.M.S 397 
XII. — Remarks on the Construction of the Planar Lens and 
its Use in Low-Power Photomicrography. By Philip 
E. Bertrand Jourdain, F.R.M.S. (Fig. 74) 399 
XIII. — On the Errors to be Corrected in Photographic Lenses. 
By E. M. Nelson, Pres. R.M.S. .. ,401 
4 
SUMMARY OF CURRENT RESEARCHES . 
ZOOLOGY. 
VERTEBRATA. 
a. Embryology. 
Garbowski, T . — Theory of the Mesoderm .. .. , .. 404 
Virchow, Hs. — Yolk-Sac of Scyllium . . 404 
Neal, H. V . — Morphology of Vertebrate Head 405 
IBecker, v . — Differentiation of Sex- Cells 405 
Guaita, Georg yon — Crosses between Different Breeds of House-Mouse . . .. 405 
Rath, Otto yom — Telegony and Maternal Impressions 40G 
Babor, J. Fl . — Hermaphroditism 40G 
Herrera, A. L . — Studies in Consanguinity 40G 
Gaupp, E . — Development of Lizard’s Skull . , . . . 406 
Fischel, A . — Regeneration of the Lens . . . . . . 40G 
Kopsch — Neurenteric Canal 407 
b. Histology. 
Farmer, J. B . — Present Position of some Cell Problems 407 
Chatin, Joannes — Indirect Division 407 
Ballowitz, E . — Annular Nuclei 407 
„ „ Superficial Position of Central Corpuscles in Epithelial Cells .. 407 
„ ,, Intermediate Body in Cell-Division 407 
Henneguy, L. F . — Relation of Centrosomes to Cilia 408 
Studnicka, F. K . — Cuticle and Intercellular Bridges 408 
„ „ Chondrified Fibres in Connective Tissue 408 
Plate, L . — Alimentary Tract of Chelone 408 
Tomes, C. S . — Enamel of Elasmobranch Fishes 408 
Welsh, D. A . — Parathyroid Glands 409 
Studnicka, F. K . — Minute Structure of Notochord, .. .. 409. 
c. General. 
Linsbauer, L. — Light-Limit in Water 409 
Brandt, A. — Bristle-like Structures on a Shark .. 409 
Cyon, E. de — Functions of Hypophysis Cerebri 409 
Tornier, G . — Regeneration and Doubling of the Tail in Lizards .. . . .. . 410 
A 
