Contents 



IX 



Cell Nucleus 



L'ultrastructure de la membrane nuclcairc dcs 

 ovocytes de I'Araignee {Tegenariu doDicsiica C lerk). 

 J. Andre et Ch. Rouiller 



Electron Microscopy on Grasshopper Spermatids. 

 F. S. Sjostrand and B. A. Afzelius 



The Acrosomal Reaction of the Sea Urchin Sper- 

 matozoon. 



B. A. Afzelius 



The Structure of Galea Capitis in Human Sperm. 

 J. Schultz-Larsen and R. Hammen 



Thyroid Gland 



The Ultrastructure of the Thyroid Gland of the 



Mouse. 



R. Ekholm and F. S. Sjostrand 



Electron Microscopy of Chick Embryo Thyroid. 

 R. Stole, P. Blanquet, A. P. Lachapele, R. 

 Maraud and A. Magimel 



Kidney 



Preliminary Studies on the Development and Dif- 

 ferentiation of Cells and Structures of the Renal 

 Corpuscle. 



B. V. Hall and L. E. Roth 



Further Studies on the Nephron Ultrastructure in 

 Mouse: Terminal Part of Proximal Convolution. 

 J. Rhodin 



Adipose Tissue 



The Fine Structure of Brown Adipose Tissue in the 

 Rat: with Observations on the Cytological Changes 

 Following Starvation and Adrenalectomy. 

 J. D. Lever 



VII. NERVE CELLS AND RECEPTORS 



Neurofilaments et neurofibrilles dans les fibres 

 nerveuses de la Sangsue. 



R. COUTEAUX 



Elektronenmikroskopische Untersuchungen an 

 Grenzstrangganglien von nienschiichem Operations- 

 material. 

 Hedi Gansler 



Ultra-structure des cellules visuelles du Gecko. 

 Mise en evidence de prolongements cytoplasmi- 

 ques infra-microscopiques au niveau du segment 

 interne. 



Nina Carasso 



Some Observations on the Structure of the Retinal 

 Receptors of the Toad Eye as Revealed by the 

 Electron Microscope. 



F. S. Sjostrand and L. G. Elfvin 



Submicroscopic Morphology of the Retinal Pig- 

 ment Epithelium. 



G. Lion, C. Maertens and G. Vandermeerssche 



Preliminary Observations on the Ultrastructure of 

 a Frog Muscle Spindle. 197 



162 .1. D. Robertson 



164 



167 



169 



171 

 173 



176 



180 



182 



190 



192 



194 



196 



VIII. MUSCLE AND OTHER CONTRACTILE 

 ELEMENTS 



Preliminary Observations on the Structure of 

 Insect Flight Muscle. 202 



H. E. Huxley and Jean Hanson 



The Ultrastructure of Skeletal Muscle Myofila- 

 ments. 204 

 F. S. Sjostrand and Ebba Andersson 



The Tubular System in the Striated Muscle Cell. 208 

 Ebba Andersson 



Elektronenmikroskopische Untersuchungen am Ute- 

 rusmuskel der Ratte. 210 



Hedi Gansler 



Elektronenmikroskopische Untersuchungen iiber 

 das Gewebe des glatten Muskels. 212 



F. GuBA UND G. Hajossi-Kerek 



Mechanism of Pigment Migration uithin Teleost 

 Melanophores. 213 



S. Falk and J. Rhodin 



The Pharyngeal Protein Fibres of the Ciliates. 216 



Ch. Rouiller, E. Faure-Fremiet and M. Gau- 

 chery 



IX. COLLAGEN, CARTILAGE, BONE 



KoUagen (Invited paper). 



U. HoFMANN UND K. Kuhn 



220 



Neue Befunde zur Struktur der Sehnenfibrille an 

 Hand von Dunnschnitten. 223 



E. Kuhnke UND K. E. Wohlfarth-Bottermann 



The Proteolytic Action of Papain Studied by Means 

 of the Electron Microscope. 225 



G. Lelli and G. Arangio-Ruiz 



Electron Microscopic Observations on Frozen Col- 

 lagen. 227 

 G. Lelli and G. Arangio-Ruiz 



Electron Microscopic Obser\a:ions on Collagen 

 Exposed to X-Rays. 228 



G. Lelli, U. Marotta and A. D'Amore 



Studies on the Fibrogenesis of Collagen. 

 Sylvia Fitton Jackson 



229 



Further Observations on the Transformation of 

 Collagen Fibrils into "Llastin". 230 



M. K. Kfech and R. Reed 



Osteoarthritis of the Hip .loint. 

 K. Little and L. H. Pimm 



233 



Correlation of Electron Microscopy with X-Ray 

 DitTraction and Optical Birefringence in the Study 

 of the Bone. 234 



V. Caglioti, a. Ascenzi and A. Santoro 



