MEMORANDA. 205 
some sand containing recent Infusoria, which, I have no 
doubt, will resume their movements on being moistened. 
They were collected on the moving sand-hills near this city, 
at a place a few yards from the ocean, and where there is not 
the least sign of vegetable life. My attention was attracted 
to them by seeing some concretions on the surface of the 
sand, which at the time was in motion from a strong wind. 
I found that these concretions consisted of agglutinated 
sand, the agglutinating substance being formed, as subse 
quent observation showed, by Infusoria. I could find no 
trace of organic matter in any of these concretions, which 
might have formed a nidus for the development of the Infu- 
soria, and I have every reason to believe that these were 
developed in pure sand moistened with rain-water. I think 
the presence of rain-water was necessary for their development, 
as I had been over the same ground frequently before, during 
the summer season, and had not noticed the concretions, 
which I believe IT must have done had they existed. The 
concretions were, in some instances, two or three inches long 
and an inch or two thick, and, when dry, they possessed con- 
siderable tenacity. JI am unable to resolve the Infusoria into 
anything definite, with a + of Powell and Lealand’s. 
[Our correspondent requests us to give some of the speci- 
mens to persons acquainted with Infusoria, which we shall 
be happy to do when they come to hand, which, we are sorry 
to say, they have not as yet done. | 
Proressor Exsurtu, of Wirzburg, mentions the occurrence 
of a new parasite, differing, it is said, essentially from Tri- 
china spirals, which infests the voluntary muscles of the frog. 
It resides in the transversely striped fibrils, into and out of 
which it bores its way, moving about from one locality to 
another. This migration is proved by the existence in con- 
tiguous muscular fibres of cavities of a peculiar character. 
The description of the Entozoa is not given.—Proceed. of 
Wirzburg Phys.-Med. Society, 1862. 
