38 
IMPERIAL COLLEGE OR 
portunity of profitably utilizing his spare working power. 
Under present conditions, the excreta of the population of 
towns and cities are by far the cheapest manure obtainable. 
Even if fish manure should still sink much in price, yet it 
will be economical for the farmer to resort to the night-soil 
of cities, if he is in a position to fetch it himself. 
The preceding calculations and results apply, of course, 
only to Tokyo and similar Japanese cities with a large 
population, where the night-soil has at any rate to be 
removed. In towns and villages, where the quantity of 
excreta to be carried away is less, and the demand is great¬ 
er, the cost of fish manure or night-soil may approach 
each other and perhaps be equal, while in those districts 
near the sea, where fish is plentiful, the fish manure may 
be even cheaper than human excreta. 
Errata, 
in Bulletin No. 2. 
Page 31, 16th line from top, read in the column straw left 
total nitrogen 0.885, instead of 18.85. 
Page 38, in the heading of the table, column 4th, read Fat 
instead of Fibre, and column 5th read Fibre, 
instead of Fat. 
Page 38, table, 1st line from bottom, digestion coefficients, 
average for fat read 88.31, instead of 89.31. 
