224 A. A. SCHAEFFER 



became the more active and in its forward movement dragged 

 the retreating left prong into contact with the globulin-carbon — 

 147. A pseudopod was then sent out against the test substances 

 which upset them so that the carbon lay between the ameba and 

 the globulin. A large food cup was then formed over both 

 substances — 149. The carbon grain was soon pushed out of the 

 food cup while the globulin was taken into the protoplasm. 

 Just how this happened could not be determined, but it was not 

 " accidental." 



Another grain of carbon together with one of globulin of 

 about the same size, were laid in the path of an A. proteus — 151. 

 The ameba moved forward to the right of the test substances — 

 153. A side pseudopod was then sent out to the left. It passed 

 the carbon on the left. A small pseudopod was then sent out 

 into contact with the globulin grain — 157. A large food cup was 

 then quickly formed over the globulin-carbon — 158 — but pre- 

 sently the carbon was pushed out while the globulin was taken 

 into the protoplasm. The details of the separating process again 

 could not be observed. 



A grain of globulin was then placed on a large grain of carbon 

 in the path of a large ameba belonging to the proteus species — 

 159. As the ameba moved forward a pseudopod was thrown 

 out on the left — 160, but it was soon withdrawn — 162. The 

 main pseudopod flowed on past the carbon-globulin and then 

 turned sharply to the right — 164. A small Y-shaped pseudopod 

 was sent out toward the test substances as the ameba moved 

 away, but it was retracted before it had covered more than 

 half the intervening distance — 164. The grains of carbon and 

 globulin were then shifted — 165. The ameba moved past them 

 a short distance — 168. The tip of the main pseudopod then 

 turned to the left and moved into contact with the test sub- 

 stances. The carbon-globulin grains which were sticking together 

 slightly, were rolled around a few times by the ameba. A food 

 cup was then formed with the test substances lying, not in the 

 food cup, but in the mouth of it — 172. Half a minute later 

 another food cup was formed over them, but the ameba did not 

 fuse the free ends of the cup until four minutes after forming 

 it — 172 . The ameba then quieted down for about thirty-minutes, 

 during which time but very little movement could be observed; 

 nevertheless the globulin and the carbon became separated from 



