611

as gathered mud and all, upon a piece of
paper - put this into a dish and cover about 1/8 to
1/4 of an inch deep with water, exposed to the
light they will crawl out of the mud and
form a circle of rays on the paper -, and by the
way they make excellent objects to compare micrometers
with, as they vary in size less than the [?].
I have been able in this way to get the small
difference which exists between Mr. [?'s] micrometer
and mine.

I am now thoroughly satisfied that Iowa will
[furnish?] to future collectors the most varied Alga
harvest. I have found so many species in my [?]
area that I am sure the whole state must be richer
there.

Yours Truly
[C.?] [N.?] [Hobby?]