18 
in powdered form, applied with an ordinary powder bellows. The 
third tree, with a height of 24 feet and a spread of 30 feet, was sprayed 
with self-boiled lime-sulphur solution made up of 4 pounds quick- 
lime and 4 pounds flowers of sulphur in 25 gallons of water, to which 
2 pounds of arsenate of lead was added to kill an occasional larva 
of At chips postvittanus. 
Fresh material from the treated trees was gathered and examined 
on February 19. That from the first tree sprayed with nicotin sul- 
phate and fish-oil soap, revealed only 10 living Eriophyes after a search 
for a half hour with a microscope. On the second tree, which had been 
treated with flowers of sulphur in powdered form, many dead but also 
many living mites were found. The material from the third tree, which 
had been sprayed with self -boiled lime-sulphur, showed few Eriophyes 
where the spray had settled, but in places that had escaped many 
were living. 
The treatment was repeated on February 26, 1916. Later exami- 
nation disclosed results so much more favorable to the nicotin sul- 
phate and fish-oil soap that the other treatments were abandoned. 
This spray was applied again on March 28, and April 11 and 25. One 
tree received treatment on March 11. By the end of April the mites 
were practically eradicated. 
IMMUNITY OF THE LONGAN. 
A longan tree, situated about midway between two of the diseased 
litchi trees referred to above and less than 50 feet from either, has 
presented no indication of erinose, and a search of the leaves has 
revealed no Eriophyes, although certain other mites are present, pro- 
ducing a yellowish-powdery effect, not uncommon on mite-infested 
plants. 
VARIETIES. 
There are many varieties of litchi, propagated by the air-layering 
or "gootee" method referred to above and cultivated under varietal 
names. The origin of most of these varieties is unknown in this 
country, and, indeed, the origin of some of them is so ancient that it 
is doubtful whether the most careful research in the lands to which 
they are indigenous would reveal anything of value concerning 
them. It is probable that most kinds have originated as chance 
seedlings, although some may have arisen as bud mutations. Fruits 
of established identity are not available for the making of accurate 
pomological descriptions of any of the varieties, and no full de- 
scriptions have been found. The following fist of choice varieties in 
China, with valuable notes concerning each, has been taken from a 
report by United States Consul F. D. Cheshire: 1 
i U. S. Dept. Agr., Bur. Plant Indus., Plant Immigrants No. 111-112 (1915), pp. 918, 919. 
