BULLETIN OF THE BUSSEY INSTITUTION. 303 
A comparative trial made with simple (uncalcined) loam from 
the Bean-plot gave the following results: Each jar contained 
1026 grms. of the air-dried loam. 
I The crops. 
it Harvested April 17th, 1875. 
pd The loam was watered with Weighed ithe Sd Had 
< grammes. bess oaks seeds. 
1 | Sulphate of potash. . . kee a0 ae MOTE ode 2.400 144-173 40 
De eEORetG GL DOtNSH = 5. 4). 30 se 8 2.950 17-204 42 
DPITIMUG MIL DOUNST 94 ( 5 se mw Bw lw 3-710 163-23 54 
Ey a Oe an rr 1.830 134-194 36 
Ao) Ce Ver PS So re 2.845 14-17 34 
6 | Phosphate of potash and nitrate of potash . 5.800f 263-30 71 
7 | Phosphate of potash and nitrate of lime*. . 7.850 253-354 132 
* Used alternately. t Only 2 plants. 
The experiments with calcined loam alone went to show (com- 
pare Nos. 1, 3, and 5) that all the loams contained a good deal of 
phosphoric acid, of potash and of lime, and it is noticeable that 
the Bean-plot loam, which was taken in September, 1874, from an 
experimental plot, B 5 Beans,* which had been cropped continu- 
ally during four years without manure, gave rather smaller crops 
than the rest. But there is a lack of emphasis in the difference 
between the results obtained from the original Plain-field loam 
and the Bean-plot loam which is in singular contrast with the 
difference exhibited by the field experiments. 
Contrary to the previous experiments, the application of potash 
seems to be of some use to Mr. Appleton’s loam, as well as in the 
case of the Plain-field earth, and the Bean-plot loam ; though it did 
no good upon Mr. Saltonstall’s loam. ‘The loam from Mr. Salton- 
stall, from a poor old pasture, seemed best on the whole, as it had 
in the previous trials. It was noticeable that the crops upon all 
the calcined loams did very much better when watered with 
nitrate of lime than a number of sands similarly watered which 
were cultivated beside them. See p. 306. 
In the hope that the differences between the loams might be 
brought out more clearly by employing them in a somewhat diluted 
state, new portions of several of them were calcined and mixed 
with Berkshire sand, in the proportion of 560 grammes of the cal- 
cined loam to 760 grms. of the sand, before proceeding to grow 
the crops. The results of the trial will be found in the lower table 
on page 302. ‘Taken in connection with all that had gone before, 
* Bussey Bulletin, 1, 88. 
