5 2 4 Journal of Agricultural Research voi. xi, no. io 
available on that day. Neither are the daily normal temperatures ob¬ 
tained by Bigelow’s method (2) accurate indexes of temperature. They 
are, however, the best approximations available, and, as the writer has 
elsewhere stated, if progress is soon to be made in understanding the 
climatology of plant diseases, a serious effort should be made to utilize 
the climatic data now at hand. 
A summation of remainders as a method of estimating temperature 
efficiency is open to serious criticism on theoretical grounds, and other 
methods of integrating temperature have been suggested by Livingston 
(6). For temperate climates it is not apparent that either of these is 
greatly superior to a summation of remainder indexes. In a recent 
study the writer (9) has compared the growth of Endothia parasitica in 
various localities with the temperature computed by the methods of 
“Physiological summation indexes,” “Exponential summation indexes,” 
and “Remainder summation indexes.” In that case at least, the last 
method gave results fully as satisfactory as the others. McLean (7) 
compared the two last-named methods of temperature summation in 
connection with a study of climatic conditions in Maryland and found 
that the two methods agreed in showing a clear relation between tem¬ 
perature and plant growth at the stations used, but he states that— 
no evidence was wrought out as distinctly in favor of either of the two methods. 
TEMPERATURE RELATIONS OF CRANBERRY FUNGI 
Two fungi known to be important causes of fruitrots of the cranberry 
have been selected as types: Glomerella cingulata (Stonem.) S. and v. S., 
abundant during certain seasons in New Jersey and on early varieties 
in Massachusetts, and Fusicoccum putrefaciens Shear, which occurs com¬ 
monly in Wisconsin and Massachusetts, especially on late varieties, but 
which is comparatively rare in New Jersey. The temperature relations 
of these fungi as indicated by their growth on corn-meal-agar plates 
have been tested in the constant-temperature apparatus described by 
Brooks and Cooley (3) and are given in Table II. The figures given are 
in all cases averages of the results of several tests. 
Table II .—Average growth of fungi on corn-meal-agar plates for 15-day periods 
Temperature. 
Growth of 
Glomerella 
cingulata. 
Growth of 
Fusicoccum 
Putrefa¬ 
ciens. 
°C. 
2 K . 
Cm. 
8.0 
5.8 
2.9 
I. O 
O 
0 
Cm. 
4.0 
3-3 
2.3 
1-3 
.8 
•4 
20.* ... *. 
IC. 
10... 
c. 
0. 
