30 
abundantly between tide-marks. In September, I found the same 
species of Polysiphonia as in July, but the plants were much denuded; 
P, fibrillosa^ Grev., I found for the first time here, and in good con- 
dition; Griffiihsia had disappeared; 7?<:r^_;'^? and Grinnellia^tx^ repre- 
sented only by small forms growing on Zosiera; Chainpia was very 
abundant and well developed, with abundance of both kinds of fruit, 
and I found a small frond of Gradlaria 7nidtipartita^k%.^ var, angus- 
tissima^ Harv., 
All the species named are characteristic southern forms, most of 
them hitherto unknown in this region; and the locality is full/ open 
to the ocean, shipping passing in and out continually. The water is 
undoubtedly warmer than in Massachusetts Bay, but the difference 
cannot be very great, as the tide rises and falls from six to eight feet, 
and the rapid current in and out must mix the waters quite thor- 
oughly. This is quite different from Goose Cove, where there is 
almost no communication with the sea, and the summer temperature 
V is quite high; yet, as we have seen, the Weymouth flora is much the 
richer. I think it probable that similar *' colonies" must occur at 
other points on the shore, especially along Plymouth and Barnstable 
Counties. One certainly exists at Trui-o, on the inside of Cape Cod. 
Among algae collected by Mr. W. P. Rich, I found fine specimens of 
Spyridia filamentosa^ Harv., the only reported instance north of Vine- 
yard Sound, and also \\\t Griffith si a ^ Mesogloia^ Champia^ ^x\^ Polysi- 
phonia variegata found at Weymouth. It would be interesting to 
know if there grew at any such places some species equally common 
in southern New England with the plants found at Weymouth, such 
as Sargassuyn vulgare^ Ag., Stilophora rhizodes, Lyng., Hypnea musci- 
formis^ Lamour., etc, 
I also found at Weymouth, in addition to the species named and 
the ordinary species of the vicinity, Casiagnea Zosienz^ Thuret, DiC^ 
iyosiphon fa^nicidaceus, Grev^, subspecies flaccidus^ Aresch., Bryopsis 
plumosa^ Lamour, an Ulva and an Ectocarpus. Both the latter are, 
I think, new to America, but I defer further mention until I am more 
certain of the species. It is interesting to observe how the warm 
southern and the arctic floras meet here. Dasya elegans is a char- 
acteristic plant of the Mediterranean basin, and does not extend north 
of Spain; at Weymouth it grew in the greatest luxuriance, while the 
tide brought up from the lower harbor Euthora cristata-^ Ag., an" 
Ptilota serrata, Kiitz., toth arctic species, the former reaching its 
southern European limit in the north of Great Britain, the latter m 
Norway. 
F. S. Collins. 
Cement for Mounting Plants.— Take of bisulphide of carbon 
anv quantity desired, and dissolve therein a sufficient quantity ot 
crude India rubber to make a cement of the proper consistency 
This is the best c 
mounting plants, as 
It is always ready for u»e. 
Paola, Kansas. 
:ompound that can be made for the purpose ox 
s-well as for use where a strong cement is desirea. 
J 
