CORRESPONDENCE. 311 
Chenopodhim Bonus- Henricus, L. — Very rare within twelve miles of 
Plymouth. I have only seen it by the roadside at Puslinch Hill, close 
to Puslinch House. The garden is very near, and thence probably the 
plant was derived, but is now quite naturalized. 
Hamulus Lupulus, L. — Truly wild in the valley of the Yealm near 
Yeo. Frequent in hedgerows in damp situations, but generally when 
they are near villages or houses. 
Orchis Mario, L. — In an uncultivated bushy spot, on limestone, ad- 
joining Radford quarry, near Plymstock (vide Seemann's Jo urn. Bot. 
Vol. IV. p. 293). 
Tf/pka angustifolia, L.— In a marsh by the Tavy, at Lopwell, where 
the commoner T. latifolia, L., also occurs, 
believe, new to the county. 
All the places mentioned above are in Devon. 
4, Portland Villas, Plymouth, September 23, 1867. 
tift 
CORRESPONDENCE. 
On Pleurococcus Beigeli. 
According to Dr. Tilbury Fox's letter in the August number of this Journal, 
we have to record a new stage into which Dr. Fox's knowledge of Pleurococcus 
entered. That gentleman's first opinion was, that my Pleurococcus was identical 
with Zooglea capillorum. Some weeks later lie was quite sure— because a 
friend of his well versed in microscopic examination of minute life told him so 
-that my Pleurococcus was nothing but Gregarines, which lie had grow- 
ing in a iaccharine solution, and which he promised to bring before the Patho- 
logical Society, but which he never did. Dr. Fox's third opinion was, that my 
Pleurococcus was a new fungus, and he (Dr. F.) its discoverer. His fourth 
opinion, Pleurococcus Beigeli— notwithstanding what authorities of world-wide 
renown might think— did not exist at all, and must now be considered " de- 
funct. 
Xow, I humbly submit that, before accepting this conclusion, it would be advi- 
sable to wait for the next development of Dr. Fox's opinions ; for I am afraid 
that he will as little be able to declare Pleurococcus as " defunct " as he was to 
exalt it to the rank of a Gregarine. The way which led Dr. Fox to the Ia,t 
conclusion is as curious as it is new in science. Dp to the present time it has 
been customary-and, as it seems, will be so in future-to assign reasons for 
abandoning one opinion and accepting another. This custom Dr. Fox thinks 
obl-fashioned and superfluous, saying only, " I did one thing-thoroughly <W 
^bed Pleurococcus Beigeli. It (the paper in the < Science Gossip ) showed that 
I 
can only advise Dr. Fox to read his paper again, and he will alter his opinion. 
