THe Spray PROCESS 307 
and that the total solubility is very slightly greater in the case 
of the more flaky milk powder made from uncondensed milk. 
In these experiments the amount of milk powder, the amount 
and temperature of the water and the kind and amount of me- 
chanical agitation were exactly alike. At the end of one minute 
from the time the milk powders were put into the water, the 
amount of solids dissolved was practically the same in the case 
of the flaky powder made from uncondensed milk as it was in 
the case of the granular powder made from pre-condensed milk. 
And after that the percentage of total selids dissolved from the 
powder made from uncondensed milk was slightly greater than 
the percentage of total solids dissolved at the end of the same 
respective periods of time from the powder made from pre-con- 
densed milk. : 
Here again it should be understood that uncondensed milk 
may be so atomized and dried (large orifice of spray nozzle and 
low pressure) to increase the size and granular condition of 
the particles of the resulting powder sufficiently. so that for 
all purposes for which milk powders are used commercially and 
domestically the ease or difficulty of solution is no longer any 
factor. 
Effect of Pre-condensing on Recovery of Spray Milk Powder. 
—The finer, lighter and more fluffy the milk powder the greater 
is the tendency of a portion of the powder to escape from the 
drying chamber. Hence it is obvious that the product from un- 
condensed milk, when desiccated in such a manner as to intensify 
the flakiness at the expense of a granular condition (small orifice 
of spray nozzle and high pressure), will tend to escape from 
the drying chamber more profusely than the more granular 
powder made from pre-condensed milk. Pre-condensing facil- 
itates maximum recovery. 
It should be borne in mind, however, that the fineness of 
some of the particles of dried milk made from either uncon- 
densed or pre-condensed milk, makes necessary the use of an 
efficient dust collector. Without such a dust collector, a portion 
of the finer and lighter particles will be lost in either case. Jy 
the case of the flakier and finer product of uncondensed milk, 
the dust collector must be such as to collect a product of that 
