36 TILBURY FOX, ON SKIN DISEASES 
latter being always of the same kind, but more or less fayor- 
able to the growth of fungi. 
The proofs of the identity of the various fungi are too nu- 
merous to give adigest of themhere. This diagram, however, 
from p. 176, gives a general idea of their connections, Torula 
being the centre round which they group themselves. 
MICROSPORON MENTACROPHYTES 
_— WAIL FUNEUS 
ACHORION 2 TRICH, TONSURANS 
TRICHOPHYTON SPORULO/DES | FAR FUNCUS 
WV 
ly 
OIDEUM <—— LEFTOMITUS <——( TGRULA ASPERGILLUS —__. 
. : > TORULA 
PENICILLIUM — 
BENNETTS FUNGUS > SARCINA 
VACINAL PARAS/TE MUCOR 
| PUCO/NIA 
ai 
FAR FUNGUS — CHIONYPHE CARTER/ 
Leptothrix is not included m this diagram by Dr. Fox, 
though he considers it allied to Torula. 
These difficult experiments consisted in growing the fungi 
in saccharine solutions and other media, carefully excluded 
from the air; they were frequently examined, and the plants 
were seen to pass through many forms generally considered 
as distinct. Asin such experiments great exactitude is rightly 
demanded before implicit faith can be placed in the results 
obtained, Dr. Fox states that more details can be forthcoming, 
if necessary. Supposing everything correct—and we firmly 
believe so from the great care evidently bestowed on his ex- 
periments by the investigator, and from what he says in the 
preface—absolute proof of the identity of these fungi is given. 
There is only one fallacy into which we think it possible 
Dr. Fox may have fallen, and that is, the mistaking of s¢mi- 
larity for identity ; we are reminded of this by figures 8, 10, 
11, and 13, of plate 11, which represent the results of an ex- 
periment proving that Sarcina can be produced from the 
aggregation of the spores of Peenicillium. These quaternate 
aggregations of spores certainly present some similarity to 
Sarcina ; but, if correctly figured, scarcely seem to be iden- 
tical. It is possible, though by no means proved, that Sarcina 
may be the spores of a fungus, as Mr. Berkeley observes, 
(‘ Gardener’s Chronicle, 1857)—-though why it should never 
develop a Mycelium under the most favorable circumstances 
for such development is not evident—but that every quaternate 
