1886,] - ... Botany. 281 
the residue showed no indication of carbonaceous remains. In the 
course of a few days a film again began to appear on the filtered 
water, which was found to consist entirely of the same diatoms, 
A control experiment showed that none of these diatoms, though 
exceedingly minute, would pass through the filter-paper em- . 
k ployed, and the conclusion seems inevitable that the diatoms 
y ee have passed through in the form of microspores.—A. 
ennet 
BOTANICAL LABORATORIES IN THE UNITED STATES.—In a most 
instructive paper in the December number of the Botanical Gazette, 
Mr. Arthur gives descriptions of some of the more important bo- 
rh laboratories in this country. Those noticed are ie fol- 
owing: 
1. Harvard University. (a) The laboratory in connection with the Gardens. 
(6) The laboratory M Cryptogamic mgs in the Agassiz museum, (c) The 
mr ayo of ae anerogamic bot n Harvard Hall. Twenty-one compound 
microscopes eet er 
2: Corneil University, (a) The labaratory for rg ota and general phanerogamic 
ork with eleven dissecting a NR (4) T + der aig pets laboratory and 
aiersiaiy, supplied with twelve compound microscopes. 
3: University of Pen ennsylvania. (a) L rune for junior work, containing an out- 
A of ree microscopes. (4) Laboratory a senior work. ‘These contain 
è enty r compo ound microscopes 
4. Mine Univers ce Laboratory and green-houses, supplied with twenty-one com- 
be a © 
5- Michigan Agricultural Prane _Laboratory and conservatory, an with 
te, 
8. Wa abash a (2) paghari for elementary botany, with an outfit of dis- 
asn croscop @) Laboratory for advanced botany, supplied with twen enty 4 
9. Perdue. ener Laboratory supplied with eee compound microscopes ; 
a an equ mber of d 
se 10. ira of ie a, (2) 5. rene for elementary work, supplie ed with 
Opra i Seded Diop (0) Laboratory for advanced ‘work, supplied 
: twenty-five co sag de crosco ER 
Ir. University of Nebras Laboe ratory s upplied with twenty-five dissecting micro- 
; an reat ero Coddington hand-lens: - a elementary work; and 
on wenky-twi und microscopes a ioe advanced wo 
: 12, 7 he hee Schoo? a of Botany. Laboratory spied with sixteen r micro- 
scopes for ER work, and four 
, they will prove ve very useful and instructive, 
nner in Fungology. 
