652 Journal of Applied Microscopy. 



right side ; the muscles of the right half of the head, neck, back, and tail were 

 greatly weakened at first, but recovered their normal tonus. Chewing motions, 

 controlled by the muscles of the right side of the cheek, were also affected. The 

 animal afterwards learned to jump, but could not use its right hand and foot in 

 trying to reach any particular point, as well as before. It reached for things 

 with its left hand, and whenever only one hand was required preferred to use the 

 left, but could use the right when both hands were required. When walking on 

 the ground it used both feet, but often only the left hand. In climbing it made pur- 

 poseless motions with the right hand. The right side retained its sensibility, 

 and the animal could always locate the point of stimulation. 



In disposition the ape was moody and malicious at first, and although it 

 could be coaxed into good humor, it was liable to sudden fits of anger. 



Hearing and taste were not affected, but the right visual field was affected 

 by the operation. In general, the disturbances were similar to those noted in 

 the dog for the same operation. 



The ape was trained to use the right hand again for definite purposes. It 

 learned to carry food to the mouth, and would shake hands with the right hand, 

 but the fist opened with difficulty, and there was a marked preference for the use 

 of the left hand. Motions of the right side were always imperfect. 



Examination after death showed that the voluntary muscles of the right side 

 had lost the cross striae, while those of the left side were normal. 



Goltz thinks there must be conducting tracts between the right side of the 

 cerebrum and the muscles of the right side, and he also believes that changes 

 connected with the increase of irritability occur in the unmutilated part of the 

 brain and in the spinal cord. e. m. b. 



Harrington, N. R„ and Learning, Edward. The A number of experiments made upon 

 Reaction of Amoeba to Lights of Different . , , , • i- ^ .1 ^ -^ 



Colors. Am. Jour. Physiol., 3 : 9-18, pi. i, Amoiba proteus indicate that it pos- 



1899. sesses the same kind of sensitiveness 



to different intensities of light, and to light from different parts of the spectrum, 

 that is shown by some of the lower plants. 



The intensity of the light is a strong factor in retarding and accelerating 

 motion, but the decisive factor is color. 



White light stops the streaming motion of amoeba, producing a tense, rigor- 

 like condition which is followed, when the action of the light is continued for 

 some time, by a spasmodic but usually futile attempt to form pseudopodia. 

 This light rigor is considered identical with that demonstrated in Nitella and in 

 bacteria. Red or green light causes the streaming to start, while violet light 

 retards it, or will stop it completely in a few seconds. Yellow light starts motion 

 and also reverses the direction of the pre-existing flow. The action of the 

 different colors is relative and depends to some extent upon the order in which 

 they are used. Violet light is inhibitive, but used after white light it produces 

 flowing. 



In some cases, when the water supply on the slide had become exhausted, the 

 amoeba ruptured and lost its nucleus ; if this enucleated part was supplied 

 with water, it gave the same reactions to light as the normal amoeba. 



