666 SUMMARY OF CURRENT RESEARCHES RELATING TO 



us formation that body breaks down, but it is impossible to decide 

 whether its material goes to the spireme or is used up for some other 

 purpose. No chromosomes come bodily out of the nucleolus as lias been 

 described for Spirogyra. (>. The spindle is cylindrical, with broad poles, 

 much resembling that of Spirogyra. 7. In the telophase a dispireme is 

 formed, and in this the nucleoli reappear as small spheres, which 

 partially fuse to form larger masses. 8. The two daughter-nuclei move 

 amund'thechromatophore, between its ridges, apparently in an amoeboid 

 manner, to their new positions. 9. The new end wall is put across in 

 essentially the same manner as in Spirogyra, that is, by a growth inward 

 from the periphery. 10. Division in these species of Glosterium is at 

 least a two-night process : the chromatophore divides the first night : 

 the nucleus the second night. 11. The position of the young transverse 

 wall would seem to indicate that the pointed ends are secondarily formed, 

 and that Glosterium was originally a filamentous alga, which has 

 developed the habit of breaking up into single cells. 



Botrydium granulatum.* — J. Burton describes a plentiful growth 

 ill Botrydium granulatum which he found at the Welsh Harp Reservoir 

 last October. After a few remarks on its systematic position, he dis- 

 cusses the various modes in which it reproduces itself, and finally points 

 out that our knowledge of the alga is not yet complete. 



Vaucheria terrestris.f — E. Paque writes a short account of 

 Desroche's work on this species. % Desroche placed some authentic 

 specimens of Vaucheria terrestris in sterilized tubes containing Knops' 

 nutritive solution. The specimens in question were about 2 mm. in 

 length, and each bore the characteristic sexual apparatus. Thus all 

 possibility of error was avoided. These fragments germinated, aud at 

 the end of a year six of them had grown to a length of several centi- 

 metres and bore numerous sexual organs. These organs were all of the 

 type characteristic of V. r/eminata, and therefore the author finds him- 

 self compelled to reduce V. terrestris Lyngb., to a form of V. gemmata, 

 under the name of forma terrestris. 



Codium tomentosum.§ — F. Tobler writes on the organization of the 

 thallus of Codium tomentosum. His observations were carried out with a 

 view to determine three different points : 1. Normal conditions of growth, 

 especially the development of the germinating plants. 2. Experiments 

 in restitution and observations on polarity. 3. Influence of external 

 factors, especially that of light on the thalli, or on the differentiated 

 portions of it. The author's observations with regard to the first of 

 these points coincide with the information given by Oltmanns in his 

 .Moiph. Biol. d. Algen, 1904. He finds the thallus in the highest 

 degree capable of restitution, new plants being grown from isolated 

 palisade-cells. These show from the very beginning a marked polarity 

 with the base as the centre of development. Restitutions of injuries to 



* Joura. Quekett Micr. Club, ser. 2, xi. (1911) pp. 209-12. 



+ Bull. Soc. Roy. Bot. Belg., xlvii. (1910) pp. 360-3. 



J C.K. Soc. Biol. (1910) p. 969. 



§ Flora, ciii. (1911) pp. 78-87 (3 figs.). 



