Barei 
A 
564 General Notes. [May, 
Movement is here intimately connected with the presence of free 
oxygen, which, if not present, can be produced by these organ- 
isms in the light. 
2. Paramecium bursaria, When the proportion of oxygen is 
normal, or somewhat greater than the normal amount, the infu- 
sorian is usually very quiet; if, however, it sinks ever so little be- 
low this degree, the animal becomes restless, and makes for 
places in which there is more oxygen (e. g., edge of cover-glass); 
in good light, but under otherwise similar conditions, the speci- 
mens distribute themselves equally throughout the drop. Active 
swimming is the consequence of serious diminution of the oxy- — 
gen; if strong light is then applied for some minutes, the Para- 
mcecium courses rapidly about, and if insufficient supplies of 
oxygen are added from without, it shows itself very sensitive to 
alterations in the illumination in the spectrum; it prefers red of 
between the lines B. and C. High tension of oxygen reacts 
strongly on the movements, for the animals then tend to swim 
straight or in wide curves away from the point at which oxygen 
is present in abundance. Strong illumination applied suddenly at 
this time causes violent movements, and the Paramoecium o! 
darts into the darkness, exhibiting the phenomenon of protopho- 
bia. Thus this animal is highly sensitive to differences in the 
tension of oxygen. PEEN: 
3. Euglena viridis is taken as the third type. Here the tension 
of oxygen has little to do with the movements. When the Z 
of water is partially illuminated the Euglenæ gradually assem)’ 
in the lighted area, and usually remain there; if a sha ab 
thrown upon the anterior chlorophyll-less portion of the body ae 
animal turns and behaves as if wholly in darkness. This 1s no 
due to the eye-spot which is placed here, as the reaction Is affec mee 
when the darkness first reaches the protoplasm outside it. dis- 
sensitiveness of the anterior end of the body is generally . 
tributed amongst animals, and occurs in Paramecium o a : 
spite of the greater amount of chlorophyll contained int A oof a 
terior part. Engelmann has not as yet succeeded in ng : 
or color-blind Euglene, but individuals from rsa any 
: 
and in different stages of development often show !mpe. Py 
ations in their sensitiveness to light.—/ournal Roy. ee 4 
Society, Feb. meen 
PSYCHOLOGY. 
ROMANES ANIMAL INTELLIGENCE.—Our purpose in We wil 
this excellent book is rather expository than critical. "© 
first notice the introduction to the work, and in subseque™ id 
graphs give the author’s statements as to our presen ppi 
of the mental endowments of the different groups f am 
1 Animal Intelligence. By George J. Romanes., International Scientific ; eo 
New York, D. Appleton & Co., 1883, 12mo, pp. 520. 
