intestinal cavity of civilized man as one of its habitats, but 1 
78 THE YELLOWSTONE NATIONAL PARK. 
mising that Dr. C. C. Parry acted as the botanist of the north- 4 
western Wyoming expedition of 1873, I will only add that his ob- — 
servations prove that the rewards of research in that department 
are no less promising than in other fields. 
Fifthly and lastly, there is one young but active science —mi- 
croscopy, — which has as yet scarcely entered this field, but which, 
I firmly believe, will discover within the limits of the Park most 
valuable treasures. The act of Congress providing for this reser- 
‘vation insures the preservation of the greater portion of whatever 
may be available for this purpose. 
Among the most interesting objects for the microscope, will be 
found the colloidal and filamentous products of the hot springs,” 
the minute vegetable and animal life of both hot and cold springs, 
the animal and vegetable parasites, and the numerous crystalline - 
deposits of the hot springs and geysers. 
Yellowstone Lake, in many places near its borders, is so com- 
pletely filled with a soft greenish substance in small pellets, t that it 
is impossible to dip a cupful of the water without including hun- — ; 
dreds of them. They are apparently of vegetable origin, a 
careful microscopical investigation is needed to determine their ul 
hese oR EE = oes ee ee beet 
timate structure. Whether this green matter has anything to do 
nection.{ The whole saboc ‘of intestinal ae is extremel 3 
interesting, and this particular case is, on many accounts, more 
than ordinarily so. The successive stages in the development 0 
this species, and the conditions necessary to its metamorphose’ 
have never been studied. I can only say that I do not regard Hey 
extended observation of its habits may prove the contrary- ‘ 
It would be a pleasant task to continue my subject much fa y 
but T feel that I have vnin all that is needed to prove the 
*Tuse the terms rr gene RE Ney ges Ne AE Sa x RN PTI PIS the bo 
springs, concerning the nature of which little is known. 
£ 
aya si ci + ih uae 
t Hayden states (ibid., p. 97) that these parasites are found only in the trout ta 
above the Upper Falls of Yellowstone River. This observation is, in the me : 
but I have met them, though rarely, in those of East Fork, which leads me T 
that they may occur in the main river below the falls. It is probable, I think, oe : 
itat is preéminently the lake. -o 
