100 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
media and on acid substrata is explained by supposing that the parasite 
has become accustomed to its altered environment. In guinea-pigs, 
rabbits, and dogs, both with the milky fluid, removed with antiseptic pre- 
cautions, and with pure cultivations, positive results were obtained, for 
malignant neoplasms formed in all the animals, the tumours chiefly 
affecting lymphatic glands. In all the neoplasms the parasite was 
present. One character should be specially mentioned, the presence of 
pigment and also of black corpuscles, which, according to the authors, 
represent the spores of Blastomycetes. 
Protophyta. 
a. Schizopliyceae. 
Kirchneriella.* — An examination by Prof. B. Chodat of this genus 
of Protococcoidem, established by Schmidle, induces him to place it near 
JDactylococcns or Baphidium. 
Conjugation in the Nostochiness.f— Prof. A. Borzi has observed a 
peculiar formation of spores in certain species of Anabsena (A. insequalis , 
torulosa, oscillarioides, and tenuissima sp. n«). The fertile cells are, as a 
rule, produced only in the immediate neighbourhood of the heterocysts. 
It is not always the case, especially in A. torulosa , that the contents of 
the cells are transformed into a single spore. The cell divides, the two 
segments remaining in close contiguity, but quite distinct. In the course 
of their development the two coalesce, the product of their union having 
all the characters of a nascent spore. It is noteworthy that some of these 
spores unquestionably result from the union of bodies derived from the 
same cell, but the two differ somewhat in volume. 
Movement of Diatoms.f — According to Herr P. Hauptfleisch there 
exists, in Amphiprora quarnerensis , Amphicyma data, and Brebissonia 
Boeckii , a canal which penetrates the raphe, is in open communication 
with the interior of the cell, and is clothed with protoplasm. From this 
protoplasm fine threads pass through delicate pores in the membrane ; 
and it is by means of these threads that the diatom is able to perform 
its creeping movement. At the poles these threads are wanting. For 
Pinnularia also the author is not able to accept Muller’s § explanation 
of the movement, but believes it to be due to a similar cause. 
The author also describes the formation of auxospores in Brebissonia 
Boedcii , in a manner similar to that of Frustulia saxonica. 
j8. Schizomycetes. 
Bacillar Disease of Vines. — MM. E. Prillieux and G. Delacroix |j 
assert that the disease of vines known in France as “ aubernage ” and 
“ roncet,” in Italy as “ mal nero,” is due to a microbe which finds its 
way into the tissues through external wounds. It may take the form of 
a Streptococcus or of a Leptoihrix , and it is to this that is due the 
* Bull,' Herb. Boissier, iii. (1895) pp. 308-15 (1 fig.). 
t Bull. Soc. Bot. I tal., 1895, pp. 208-10. 
J Mitth. Naturf. t Y er - Neu- Vorpommern u. Riigen, xxvii. (1895) 30 pp. and 
10 figs. See Bot. Centralbl., lxiv. (1895) p. 116. § Cf. this Journal, 1894, p. 607. 
•I Ann. Inst. Agronom., xiv. (1895) 32 pp. and 1 pi. See Bull. Soc. Bot. France, 
xlii. (1895) Rev. Bibl., p. 536. Cf. this Journal, 1894, p. 492. 
