SUMMARY OF CURRENT RESEARCHES 



RELATING TO 



ZOOLOGY AND BOTANY 



(principally invertebrata and cryptogamia), 



MICEOSCOPY, Etc.* 



ZOOLOGY. 



VEETEBRATA. 

 a. Embryology, t 



Improved Method of Artificial Parthenogenesis.^ — Jacques Loeb 

 has combined a solution of sodium-chloride with ethyl acetate, and finds 

 that the combination is so effective in inducing artificial parthenogenesis 

 that 100 per cent, of the eggs develop. The effective factor in the 

 ethyl acetate seems to be the acetic acid. 



Formation of Centrosomes in Enucleated Egg-Fragments.§ — N. 

 Yatsu finds that enucleated fragments of the eggs of Cerebratulus 

 lacteus, subjected to calcium chloride solutions, form rayed systems, in- 

 cluding centrioles. It is not possible to induce the formation of rays 

 before the nucleus has resolved itself to form the first directive spindle. 



Origin of a Rete Mirabile.||— J. Tandler has studied the develop- 

 ment of the arterial rete mirabile in the sinus cavernosus of the pig. 

 It arises by budding from the wall of a primarily simple vessel, not from 

 the persistence of capillaries. In more general terms, the network is due 

 to secondary formation, not to the persistence of an embryonic condition. 



Development of Primitive Kidney in Chick.H — E. Grafe has in- 

 vestigated some points in the development of the kidney and its vessels. 



* The Society are not intended to be denoted by the editorial " we," and they 

 do not hold themselves responsible for the views of the authors of the papers 

 noted, nor for any claim to novelty or otherwise made by them. The object of 

 this part of the Journal is to present a summary of the papers as actually pub- 

 lished, and to describe and illustrate Instruments, Apparatus, etc., which are 

 either new or have not been previously described in this country. 



t This section includes not only papers relating to Embryology properly so 

 called, but also those dealing with Evolution, Development, Reproduction, and 

 allied subjects. 



t Univ. California Publications, ii. (1905) pp. 83-6, 89-92. 



§ Journ. Exp<§r. Zool., ii. (1905) pp. 287-312 (8 figs.). See also Zool. Zentralbl., 

 xii. '(1905) p. 551. 



|| Verh. Anat. Ges. xix. Vers. See also Anat. Anzeig., xxvii. (1905) Erg. heft, 

 pp. 153-5. 



^ Arch. Mikr. Anat., lxvii. (1905) pp. 143-230 (5 pis. and 17 figs.). 



April 18th, 1906 m 



