620 
G. H. DREW. 
corpuscles. Another source of error consists in using tubes 
containing’ air at the closed end, when the fluid may be 
expelled, or blood sucked in, as a result of changes of tempera- 
ture. Even when the tube is completely full, time must be 
allowed after sealing the end, for it to take up the room 
temperature. The water in which the animal is kept should 
also be at the I’oom temperature, and the tube should never 
be touched with the hand, to avoid warming. 
I consider that these experiments show that cultures of 
bacteria and extracts of dead tissues have a positive chemio- 
tactic attraction for the coi'puscles. 
Bibliography. 
A full and exhaustive bibliography of the subject up to 1896 is given 
by De Bruyne in his “ Contribution a I’etude de la Phagocytose (1),” 
published in the ‘ Arch, de Biol.,’ Tome xiv, pp. 231-236. 
The following references only include those papers directly bearing 
on the subject in hand. 
1. Broun, H. G. — ‘Das Tier-Reich. MoUusca.,’ Abtlilg. ii, Leipsic, 
1907, p. 604. 
2. Cuenot, L. — “ Etudes sur le Sang et les Glandes Lymphatiques,” 
‘ Arch, de Zool. Exper. et Gen.,’ Deuxieme Serie, Tome ix. Paris, 
1891. 
3. De Bruyne, C. — “ Contribution a I’etude de la Phagocytose (1),” 
‘ Arch, de Biol.,’ Tome xiv, Paris, 1896, p. 161. 
4. Dakin, W. J. — " Pecten.” ‘ Liverpool Marine Biological Committee 
Memoirs,’ xvii, London, 1909, p. 73. 
5. Frederique, L. — “ Sur rhemocyanine,” ‘ Comptes Rendus,’ Bd. 115, 
Paris, 1892, p. 61. 
6. von Fiirth. 0. — ‘ Vergleichende chemische Physiologie der neideren 
Tiere,’ Jena, 1903, p. 60. 
7. Geddes, P. — “ On the Coalescence of Amcfiboid Cells into Plasmodia, 
and the So-called Coagulation of Invertebrate Fluids,” ‘Proc. 
Roy. Soc.,’ vol. XXX, London, 1880. 
8. Griffiths, A. B. — ‘ Respiratory Proteids,’ pp. 29-.S6, 50-67, 71-73, 
London, 1897. 
9. Lankester, E. Ray. — “Preliminaiy Notice of Some Observations 
with the Spectroscope on Animal Substances,” ‘ J ourn. Anat. and 
Phys.,’ Bd. 2, 1867, pp. 114-116. 
