Per cent 
Per cent. 
Total 
Amide 
Per cent. 
Nitrogen. 
Nitrogen. 
Apr. 20 . 
.... 2.9O . . 
. ... 1.08 . 
. 37- T 9 
“ 29 . 
T OO 
. 38.24 
May 11 . 
....3.07 ... 
- 1.32 . 
. 43 -oi 
“ 30 . 
.2.45 .. 
.46 • 
.18.77 
“ 3c (2d cut). 
• - • • 3-77 •• • 
... I .IO . 
. 29.29 
Average. .. 
Alfalfa not irrigated :— 
Aor g 
. 4.12 .. 
. . . . 0.13 . 
. 3.14 
1 . j. 
“ OJ 
. . .4.11 .. 
.... 1.1 5 . 
. 28.00 
May 11 . 
. 2.78 .. 
. . . .0.80 . 
... . 28.85 
Average. 19-99 
According to this series of analyses the proteids make 
up for the average, 65.69 per cent, of all the nitrogenous 
compounds in the first cutting alfalfa hay grown under irri¬ 
gation ; and 70.71 per cent, of those of the second cutting 
grown under like conditions. But of these compounds, in 
the first cutting grown without irrigation, the proteids form 
86.69 per cent., if we take the average of the three deter¬ 
minations given, or 71.58 per cent, if we leave out the 
sample taken April 3, which brings it in better accord with 
the other results. 
These two series of determinations show clearly that 
the total amount of nitrogen in two different samples of hay, 
grown under different climatic conditions and expressed as 
proteids, cannot safely be taken as a measure of their re¬ 
lative value for feeding. As an example in point we will 
compare the Texas sample, collected May 11, with our 
sample of first cutting hay,made when the plant was in half 
bloom. According to Mr. Harrington’s analysis, the Texas 
sample shows, nitrogen equal to 19.18 per cent, proteids or 
albuminoids, and our own air dried sample I4-4 1 P er cent. 
We should, accordingly, give preference to the Texas hay, 
but, when we deduct the amides, we find the Texas sample 
has 10.97 P er cent.; while the Colorado sample has 12.08 per 
cent, of the more valuable albuminoids left. So far as 
these are a measure of the feeding value of hay, the Colo¬ 
rado sample is really the better. If the plant were to be 
turned under as a manure, the more nitrogen the better, 
other things being equal. The difference in the amount of 
amides present in the two series is very great, but the meth¬ 
ods used by the analysts were the same, the figures corre¬ 
sponding closely to the difference in the samples. 
Our series of samples shows that the second cutting is 
