ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 287 



rhombic crystalline-like form ; whether actual crystals are present is not 

 certain. 



Infundibulum in Fishes.* — Fr. A. Gemelli has made an histological 

 study of the infundibular region in lamprey, sturgeon, salmon, and carp. 

 His most important point is that the nervous lobe of the hypophysis is 

 in these forms most definitely separated off from the glandular lobe, and 

 shows in its minute structure a remarkable approximation to sensory 

 structures such as epiphysis and olfactory mucous membrane. The 

 possibility of its being in part a sensory organ is suggested. 



Rod-like Gland Cells in Fishes are Sporozoa.f — E. Laguesse main- 

 tains that the " Stabchendrusenzellen " described in various organs of 

 fishes by Marianne Plehn are really Sporozoa. Thelohan and Laguesse 

 described the occurrence of these parasites in many fishes in 1892, and 

 Laguesse named one of them (in 18!) 5) Rkabdosphora thelohani. 



Endocellular Nets in Ganglion Cells.J — G-. A. Jaderholm asserts 

 that the statements of Donaggio, Cajal, etc., that the neurofibrils form 

 nets in the ganglion cells (especially motor cells), is untenable. He has 

 investigated the subject, and finds that different results are obtained by 

 different methods of fixation. The method which gives figures nearest 

 to the actual condition of the cells is that of Bethe. 



Nerves of Auditory Organ in Petromyzon fluviatilis.§ — R. Krause 

 describes the relations of the nerve-endings in the neuro-epithelium, 

 the minute structure of the hair-cells of the crista and macula, and 

 discusses the homology of these hair-cells and ciliate cells, between which 

 he recognises many agreements. 



Study of Cartilage. ||— Josef Schaffer continues his study of the 

 different forms of cartilage. He describes in detail the cartilaginous 

 tissue in Myxine glutinosa, and the cartilage-like vesicular support- 

 ing tissue in the same animal. Reference is also made to the hard 

 cartilage-tissue in lampreys, and there are some notes on the mor- 

 phology of the skull in the hag. 



Secretion in Liver Cells.! — E. Wace Carlier discusses the process 

 of secretion of ferments by the liver cells of the white rat, and describes 

 some of the changes observable in the cells during digestion. The liver 

 cells are called upon twice during the period of digestion to produce 

 ferments ; the first secretion of zymogen (15 minutes after the com- 

 mencement of a meal) is purely psychic in origin and perhaps reflex ; 

 the second secretion commences in about an hour after complete re- 

 covery from the effects of psychic stimulation (between the fifth and 

 sixth hour after feeding) ; the amount of the second secretion, and the 

 time required to recover from it, depend entirely on the nature of the 

 food ; the liver cells work as producers of ferment in relays ; vacuo - 



* Journ. de l'Anat. Physiol., xlii. (1906) pp. 77-86 (1 pi.), 

 t Anat. Anzeig., xxviii. (1906) pp. 414-16. 

 J Arch. Mike. Anat., lxvii. (1905) pp. 103-23 (2 pis.). 

 § SB. k. Preuss. Akad. Wiss. Berlin, xlviii. (1905) pp. 1015-32. 

 \-\\ Zeitschr. wiss. Zool., lxxx. (1905) pp. 155-258 (3 pis.). 

 f La Cellule, xxii. (1905) pp. 431-56 (2 pis.). 



