1906.] NATURAL SCIENCES OF PHILADELPHIA. 305 



mit Pereuyischer Flussigkeit erbielt ich mit Leiclitigkeit alle jene 

 Figuren, welchediese Autoreu abbildeu." Coukliu showed that, by 

 pressing a particular part of the intestinal wall with a pencil point, 

 all the nuclei in this region were caused to stretch out in a radial man- 

 ner from the place pressed. MclMurrich distinguished between irregu- 

 lar forms found after rough treatment, and those which he regarded 

 as natural. Schonichen declares that he never found auy but 

 spherical nuclei in well-preserved intestines. 



McMurrich and Conklin thought the nucleus might be more or 

 less amoeboid in life, like those described by Korschelt (21) for the 

 egg-cell of Dijtiscus, and that not all the processes found in carefully 

 mounted intestines were abnormal, but jnight be an index of the 

 physiological condition. The processes stretching toward the lumen 



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Qxf ; ;li^i'?c^ 



Fig. 7. — Cells X 600 from "mid-gut" o^ PorcelUo, showing artitkcts 

 produced by injection of fixing fluids into the lumen of the intestine and 

 consequent unilateral penetration by the fluid. A, injected with Her- 

 mann's fluid; B, with picro-acetic (after Bolles Lee). The nuclei ex- 

 hibit "amoeboid" processes. 



in fixed preparations were regarded as specializations for receiving 

 food from that direction. For a time this seemed to me to be 

 the state of affairs, and a number of sketches were made represent- 

 ing what seemed to be the escape of nuclear substance also from the 

 processes toward the lumen. Processes of greater or less size were 

 found on this side after all fixations, and it appeared that they 

 must therefore be normal ; yet I could not see them in fresh cells 

 of any physiological condition. Finally, at Prof. Conklin's sug- 



