THE INSTINCT OF SELF-CONCEALMENT AND THE 
CHOICE OF COLORS IN THE CRUSTACEA. 
By RomuaLpD MINKIEWICZ. 
(Translated by permission from Revue générale des Sciences pures et ap- 
pliquées, Paris, 20th year, No. 3, February 15, 1909.) 
‘ 
In the following pages I shall give a brief though sufficiently de- 
tailed account of the results of my investigations carried on since 
1903, which have already afforded material for a long series of pub- 
lications.¢ This series, beginning with a short article that I published 
(in Polish) in 1905, in a weekly scientific review at Warsaw (Przy- 
roda= Nature), is yet, however, far from being finished. 
I. THE SELF-DISGUISING ANIMALS. 
Although I am the first seriously to undertake this study, the 
strange phenomenon of self-concealment has in a general way long 
been known. I am not considering here animals recently discovered 
@R. Minkiewicz: (1) Krab-ogrodnik. Rev. polonaise, Preyroda, vol. 2, No. 10, 
Varsovie (mars 1905). 
(2) Sur le chromotropisme et son inversion artificielle. Comptes Rendus Ac. 
Se. Paris, t. 143, No. 21 (nov. 1906). 
(3) Le role des phénoménes chromotropiques dans l’étude des problémes bio- 
logiques et psychophysiologiques. C. R., t. 148, No. 238 (déc. 1906). 
(4) Chropotropism and phototropism. (Translation of the two preceding 
notes.) Journ. of Neurology and Comparative Physiology, vol. 17, No. 1 (1907). 
(5) Analyse expérimentale de l’instinct de déguisement chez les Brachyures 
oxyrhynques. Arch. de Zool. expériment. et génér., 1907 (4), vol. 7, No. 2. 
(6) Préba analizy instynktu metoda objektywna : por6wnawczai déswiadczaina, 
Revue polonaise de Philosophie, vol. 10, fase. 3-4, et vol. 11, fase. 1-2, Var- 
sovie (1907-8). 
(7) L’étendue des changements possibles de coleur de VHippolyte varians 
Leach. C. R., t. 147, No. 20 (nov. 1908). 
(8) Etude expérimentale du synchromatisme variable de l’Hippolyte varians 
Leach. Bull. internat. de ?Académie Polonaise de Cracovie (noy. 1908). 
(9) Sur le chlorotropisme normal des Pagures. C. R., t. 147 (nov. 1908). 
(10) L’apparition rythmique et les stades de passage de l’inversion expéri- 
mentale du chlorotropisme des Pagures, C. R., t. 147 (déc, 1908). 
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