32 BOTANY. 
tion, and seldom forming a dense sward, are exceedingly nutritious, and stock 
will make long marches having no other food. Among them we may espe- 
cially allude to the various ‘ bunch-grasses” of Colorado, 7. e., H’riocoma, 
Festuca, and Poa, and more notably still the Boutelouas of Southern Arizona, 
where, without much distinction, all are called “ grama”. 
I am here again indebted to the researches of Dr. Loew for the following 
analyses of grasses. See Lieutenant Wheeler’s Annual Report to the Chief 
of Engineers, 1875, page 138. 
Festuca ovina, from an altitude of 10,000 feet, on the Jemez Mount- 
ains, New Mexico: 
TON RE ns ae Sa a Ak BOLE PSE Swe AS OE ns 12.3 
WOM ee en Tee Vee S Goines 66 DS Ww os AEE EES EON eel eeeeT 5.4 
NI or eg ir airs ce ba hs Oa be Wis 86849 4 Dae wk oe ERS 30.2 
Fat . os ee ee 1.5 
Aancids: acseans (of swiilels 0. 073 is cin Ape er onenre b a 
Sugar, formed on digestion with dilute hydrochloric eid Sears or 10.8 
Extracted by potassa, and loss oe eee by een eee eat ase carr Mee 
100.0 
Bourexoua ouicostacuya, collected September 7 in the Abiquiu Mount- 
ains, New Mexico, at an altitude of 7,500 feet: 
WUE aa psn oo oe eas Pe cae eee 12.0 
a aa eS es ec she Ben ew Ha tulw s eee ee ek 7.8 
I i ac van ks sw noe hb we BS pen panode 24.4 
PM ea ee es ak fh 6 i wh hn ks We ves see ecw ys 2.4 
Aqueous extract (0.08 sugar) .. Spee ioae * % * 
Sugar, formed on digestion with dilute hydrochloric: core inca eee oe 
Extracted by dilute potassa, and loss... ... .. 0-205 scennco-+ ses ; iy 
100.0 
BouTELOUA HIRSUTA, ee near Las Vegas, New Mexico, November 
16, at an altitude of 6,500 feet; it was dead and dry, but without loss of 
- nutritive properties : 
NOE ee eck cs es 1 
BY: Seen wel vey eee Oe ek ts ode ede Gs Fee aes 6.5 
Fibre .. = Fe or aa ag mre ah eign te geeky <a ack 
Wis penne oe as ats en Di tue oe ee Sac aense se = 2,1 
Aqueous extract 0. 09 ar (ache leet habe e bas a eb eerie eka ee 13.8 
Sugar, formed on digestion with dilute bydrochiorc a acid aise 26.3 
Extracted by dilute potassa, and loss..................... ..... 19.2 
