ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 521 
opinion are derived from the characters and the development of the 
cultural fructiferous forms of Trichophyton. These are supported by 
similarity of substrata, by production of yellow or red pigment, by the 
presence of spiral forms, and (in Gtenomyces ) by spindle-shaped and 
multicellular segments, like those so frequent in Trichophyton. In the 
same family the authors are also inclined to include Achorion and indeed 
many other pathogenic fungi. 
Sporothrix Fungus in Abscess.* — Dr. B. R. Schenck records a case 
of refractory abscess of the skin associated with lymphatic infection, due 
to the presence of a fungus related to the Sporotricha. The organism was 
isolated thrice from lesions in the arm, two of them being pure cultures. 
Cultures were easily obtained on all the usual media. The organism 
was found to be strictly aerobic, did not produce gas or coagulate milk ; 
gelatin is slowly liquefied. Cover-glass preparations show a mycele and 
conids. The mycele is doubly contoured, and branches irregularly. The 
conids are elliptical or ovate and 3-5 p in length. One illustration taken 
from a photograph shows a few mycelial threads and a large number of 
ovate spores scattered freely about and without any special distribution ; 
other illustrations taken from camera drawings show mycele and germ- 
tubes, around the ends of which are collected small bunches of conids. 
The opinion of Dr. E. F. Smith, who reported on the growth appearances, 
&c., is that it is advisable to place the fungus among the Sporotricha. 
Inoculation experiments made on animals gave positive local results 
on the dog, and positive general results (a sort of pyaemia) on mice. 
Guinea-pigs and rabbits were refractory. 
Protophyta. 
/3. Schizomycetes. 
Evolution of Bacteria.! — Dr. G. Catterina, after an exhaustive dis- 
cussion of a critical and historical nature on the phylogenetic relations 
of bacteria, gives the following genealogical tree as representing the 
probable descent. 
Archaeocoecus 
I 
Micrococci 
Bacteria 
1 1 1 1 
Diplo- Strepto- Sarcina Staphylo- 
coccus COCCUS 30CCUS 
Bacilli 
1 
Vibrios 
1 
1 
Myxobacteria 
1 
Beggiatoa 
Spirochaete Spirillum 
Mould Fungi 
Schizophyceae 
Chlamydobacteria 
* Johns Hopkins Hosp. Bull., ix. (1898) pp. 286-90 (2 pis.), 
t Bull. Soc. Veneto-Trentina di Sci. Nat., vi. (1899) pp. 155-205. 
