338 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Spermatozoa of Bats and Lemurs.* — E. Ballowitz describes the 

 spermatozoa of Pteropus, which have a large head-cap, of Microcebus, 

 Lemur, and Ghiromys. The most interesting general result is the strong 

 resemblance between the spermatozoa of Ghiromys and those of Lemur. 



Development of Salivary Glands of Cat.f — R. Metzner finds that 

 all the glands, serous as well as mucous, begin abke. Their terminal 

 parts are always like rounded or elongated berries on the ends of the 

 ducts. Later on, towards the end of the first half of the intra-uterine 

 life, the terminal portions of the mucous glands grow into tubules, 

 which soon become coiled. The terminal portions of the serous glands 

 still keep the berry-like appearance. Even at the stage of homogeneous 

 appearance, some cells of the terminal portions and also of the ducts 

 begin to show secretion granules, which are always of mucin. It is 

 noted that the production of mucus only— on to the first month of 

 post-uterine life — may have something to do with the fact that milk 

 mixed with mucus makes a more delicate coagulum in the stomach than 

 unmixed milk does. 



Development of Poison-glands in Anura.J — Otto Weiss could find 

 only one mode of origin of poison-glands in the skin of Anura, namely, 

 by a direct transformation of differentiated mucus glands. Before the 

 metamorphosis there are only mucus glands, and some of these turn into 

 poison-glands. 



Amitosis in Embryonic Tissues of Mammals.§ — A. Maximow 

 records the normal occurrence of amitosis in mesenchyme cells in various 

 parts of the embryo rabbit (11^-1 3 A days). 



Artificially Induced Albinism of the Skin in Axolotl larvaB.|| — 

 G\ Tornier has reared reddish yellow or lemon yellow larvae from black 

 parents. This partial albinism was brought about by making some of 

 the yolk unuseable — puncturing it so that some water got in and made it 

 take granular form. This comes about more readily when the embryo 

 has a weakness in its plasm, and this again can be effected by scarcity 

 of oxygen. When the eggs are put into solutions of salt, sugar, 

 glycerin, etc. for a short time, part of the yolk may coagulate, and then 

 pale larvae result. 



Development of Skull in Teleosts.1T — J. Nusbaum has studied the 

 development of the occipital region of the skull in the carp. Diverse 

 parts of the first three vertebras share in making the palaeocranium of 

 Teleosteans, the first being entirely assimilated. The centra of the 

 three unite in the basi-occipital ; the spinous processes of the three 

 coalesce in the supra-occipital. Even the fourth and fifth vertebrae 

 are implicated, but we cannot do more than indicate the general lines of 

 Nusbaum's embryological analysis! 



* Anat. Anzeig., xxxiv. (1909) pp. 275-86 (27 figs.). 

 t Verb. Nat. Ges. Basel, xx. (1909) pp. 38-54. 

 j Anat. Anzeig., xxxiii. (1908) pp. 124-5. 

 § Tom. cit., pp. 89-98 (11 figs.). 

 || SB. Ges. Nat. Freunde Berlin, 1908, pp. 66-7. 

 <\ Anat. Anzeig., xxxii. (1908) pp. 513-32 (14 figs.,. 



