NOTES. 59 
much like adunca, but has fewer and longer appendages and some- 
times sporangia with five or six spores. 
STAINING VEGETABLE Tissues. — L. Erckmann explains, in the 
« Journal of the Franklin Institute,” that the staining of plant 
sections with a weak solution of aniline red, and then washing out 
with water the color from all the non-nitrogenous parts, is not 
only useful for purposes of general study, but is especially applic- 
able in the preparation of specimens for photographic use. 
NOTES. 
A semiannual session of the National Academy of Science was 
held at Cambridge, November 21st, 22d, 23d, in the lecture room 
of the Museum of Comparative Zoology, where Professor Agassiz 
welcomed the members, and gave an account of the rise and pres- 
ent condition of the museum. Of the twenty-eight papers read 
there were presented thirteen relating to geology and zoology, 
with the following titles :— 
The Organization of the Museum of Comp. Zoology in Cambridge, by L. Acaso. 
ay three different Modes of Tee yori apard s by L. AGASSIZ 
e Development of Actiniæ, by A 
at glacial pene of the sake es compared with those of the 
SIZ. 
Affinities of aiin and Worms, by A. AGASSIZ. 
Notice of Tuvestigations making in — rnia on the Reliability of the Barometer as 
y J. D. WHITNEY. 
Pedicellariz of Ec nares by A. Fuma 
Results ap recent Dredgings on the coast of New England, ed: m si VERRILL. 
Embryological Fragments concerning the Volutidæ, by L. A 
On the specific fpern of some Animals along the Lunii ae Pacific shores of 
America, Ae oe 
The pul pra +h eal Lm i Į i 24h, AMA another, 3 24%, St ae 
of other Pacis, by Da SSIZ 
On the changes Selachians papot with age, by L. AGASSIZ. 
Critical remarks about scientific views entertained upon theoretical grounds, by 
TR of the ei of the topographical work of the Geological Survey of Cali- __ : 
fornia, by J. D. WHITN ae 
Professor Agassiz read a paper on “ Three Different Modes of 
Teething among Selachians.” He said that in former years he 
had paid considerable attention to the peculiarities of teeth among 
the Selachians, but the progress of zoology and paleontology made 
the present materials on hand quite insufficient. It was not known _ 
what changes took place with age. So he had determined upon ~ 
