604 The American Naturalist. [June, 
some time in another house; a jute-velour furniture covering, color old 
rose, also gave the arsenical mirror, and a crétonne of a black ground 
with light colored figures and pattern was highly charged with arsenic, 
even after several years’ use as curtains, indicating that use does not 
eliminate the arsenic. Tests were made of 60 pieces of lately imported 
English crétonnes, and only 20 pieces were found to be free of arsenic. 
In Germany and, of late years, in France, there are laboratories sup- 
ported by the government, where anyone may take a substance believed 
to be injurious to health, to be tested free of charge, and, as there is a 
punishment for selling any such substance, fabrics from these countries 
are very likely to be free from deleterious matter. 
There are two ways in which the arsenic may be disseminated in the 
air, first, by a chemical action forming arseniuretted hydrogen, which 
readily comes through any paper that may cover the arsenical one; 
second, a purely mechanical action, where the arsenical paper is out- 
side, by the pigment or sizing, drying and being carried off as a powder 
and breathed—both these actions may be taking place with an arsenical 
outside paper. 
SCIENTIFIC NEWS. 
The Eighth Session of the Marine Biological Laboratory at Wood’s 
Hole, Massachusetts, will last from June 1 to October 1, 1895. The 
laboratory is under the general charge of Prof. C. O. Whitman, Di- 
rector, and Prof. H. C. Bumpus, Assistant Director. 
Instruction will be given by the following staff: Howard Ayers, 
E. G. Conklin, S. Watasé, M. M. Metcalf, C. M. Child, F. R. Lillie, 
O. S. Strong, H. S. Brode, W. M. Rankin, J. L. Kellogg, P. A. Fish, 
A. D. Mead, H. E. Walter, W. A. Setchell, W. J. V. Osterhout, 
Jacques Loeb, W. N. Norman. 
There will also be evening lectures on biological subjects of general 
interest. Among those who may contribute these lectures may be 
mentioned, in addition to the instructors above named, the following : 
G. F. Atkinson, E. G. Conklin, J. M. Coulter, A. E. Dolbear, Simon 
Flexner, E. O. Jordan, William: Libbey, Jr. ; F. S. Lee, W. A. Locy, 
J. M. Macfarlane, C. S. Minot, E.S. Morse, H. F. Osborn, W: B. Scott, 
= W.T. Sedgwick, William Trelease, S. Watasé, E. B. Wilson, B. G. 
Tir, W. P. Wilson. 
