1028 General Notes. 
in a handsome quarto volume of 548 pages, and nearly one hun- 
dred full-page plates. 
e title-page bears the names of William Trelease and Asa 
Gray, as editors. In the preface, which bears date of March, 1887, 
(two). 6. Papers on Yucca, Agave, etc. (eight). 7. Papers on 
Coniferæ (twelve). 8. Papers on American Oaks (four). 9. 
cases 
printed from the original plates, while in others new plates hie 
e made, the originals having long since been destroyed. The 
ALG GROWING ON ANIMALS.—Three species of alge, ten 
ing to two genera, have been recently described as occurring on thi 
hairs of Sloths. The green species is placed in the new genus ge 
cophilus in the family Chroolepidee, and the violet ones in t : 
genus Cyanoderma, also new, of the family Chamesiphonee. 1s 
has been estimated that as many as 150,000 to 200,000 individua 
often occur upon a single hair. 
THE Use or TANNIN IN THE PLANT.—The suggestion pel 
recently been made by Professor Hillhouse that tannin may 
developed in plants as a protection against the attacks of fungi. 
RAVENEL’S HERBARIUM.—This valuable collection 18 oe 
for sale by the widow of the late H. W. Ravenel, at akin a 
It should be secured by some college, and given a permanent om 
where it may always be accessible to students of the fungi. 
