472 
Journal of Agricultural Research 
Vo . XXX, No. 5 
through into the flask. More petro¬ 
leum ether is added and reduced pres¬ 
sure is applied till all of the colored 
extract has been removed. About 7 
liters of petroleum ether are necessary 
to extract the 3 kgm. of dry powder 
which represent a little over 1 bushel 
of fresh carrots. From 1 bushel (50 
pounds) of carrots, 2,774 gm. of dry 
which is never allowed to exceed 50° C. 
About half of the petroleum ether used 
may be recovered by careful distilla¬ 
tion. The concentrated petroleum 
ether solution is further concentrated 
under reduced pressure till most of 
the carotin has separated in the crytal- 
line form. During the last stages of 
concentrating a fine current of carbon 
carrot powder ready for extraction are 
obtained. In all, an afternoon and 
the following morning are required to 
complete this extraction. 
The total re.d-brown percolate, from 
which crystals may be already separat¬ 
ing, is now concentrated on a steam- 
heated water bath, the temperature of 
dioxide which has been led through a 
calcium chloride drying tube and then 
into the flask through a capillary is 
advantageous, because it prevents 
frothing over, aids evaporation, and 
also keeps the solution under an inert 
gas. In addition, glass beads are 
added to prevent bumping. After 
