ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 565 



hands, with the fingers alternating. His conclusions arc based on data 

 for about 600 supplied by J. Arthur Thomson. 



The mode of clasping the hands is inherited ; it does not follow 

 Mendelian law ; neither position breeds true. There is no significant 

 sexual dimorphism, nor hint of assortative mating. It has apparently no 

 relation to right- or left-handedness. 



There are a number of somewhat similar problems. Thus, the males 

 of the commou black cricket (Gryllus) usually keep the right tegmen 

 over the left. 



b. Histolog-y. 



Essentials of Cytology. *— C. E. Walker has written a very useful 

 introduction to cytology. It is terse and up-to-date, and very lucid. 

 The chapters deal with the structure and parts of the cell, cell-division, 

 the meiotic phase (the whole period during which reduction is taking 

 place), the post-meiotic divisions, the male sexual elements, the matura- 

 tion of the ovum, fertilisation, the probable individuality of the chromo- 

 somes, the morphological aspect of the transmission of hereditary 

 characters, and cytological methods. 



Histological Studies. — N. Van der Stricht f gives a detailed 

 account of the histogenesis of the constituent parts of the auditory 

 neuro-epithelium, the macula? acusticae, and the organ of Corti. 



N. Loewenthal $ has made a study of the very heterogeneous sub- 

 maxillary salivary gland of hedgehog and white rat. 



August Schuberg § gives an account of the connections between 

 epithelial cells and connective-tissue cells in the skin of Amphibian larva? 

 (Axolotl, Salamander, etc.). They do not represent the persistence of 

 primary conditions ; they may be present or absent on the same area 

 in different specimens ; they may appear de novo without requiring 

 pre-existing intercellular connections. 



E. Holmgren |j describes the trophospongia or intracellular network of 

 cross-striped muscle in Arthropods and Mammals, and discusses its 

 physiological i uiportance. 



J. Duesberg 1" discusses the mitochondrial apparatus in the cells of 

 Vertebrates and Invertebrates, dealing with its varied form, its state in 

 the resting cell, its behaviour during division, its role in the structure of 

 spermatozoa, and its reaction to stains. 



Neurological Studies.— K. Schilling ** gives a detailed account of 

 the brain of the lamprey (Petromyzon fluviatUis). 



0. V. A. Kappers ff describes the brain of Am in calva and of 

 Lepidosteus osseus. 



* The Essentials of Cytology : an Introduction to the Study of Living Matter, 

 with a chapter on Cytological Methods. London : Constable and Co., Ltd., 1907, 

 139 pp., 49 figs. t Arch. Biol, xxiii. (1908) pp. 5-11-693 (5 pis.). 



X Arch. Mikr. Anat., lxxi. (1908) p. 588-666 (2 pis.). 

 § Zeitsohr. Wiss. Zool., lxxxvii. (1907) pp. 551-602 (4 pis., 1 fig.). 



Arch. Mikr. Anat,, lxxi. (1907) pp. 165-247 (8 pis., 6 figs.). 

 « Torn, cit., pp. 284-96 (1 pi.). 



** Abh. Seuckenberg. Nat. Gesell., xxx. (1907) pp. 425-46 (1 pi., 2 figs.). 

 + + Tom. cit., pp. 149-500 (1 pi., 6 figs.). 



