374 PROF. TH. W. ENGELMANN. 



The actual identity of animal and vegetable protoplasmic 

 movement has been since then more closely proved through 

 the morphological and physiological investigations of Max 

 Schultze/ linger/ De Bary,^ Haeckel/ and Kiihne y" and a 

 more complete knowledge of the movement and its manifold 

 conditions has been afforded by these authors as well as by 

 Naegeli, Briicke, Heidenhain, Cienkowsky, Hofmeister, and 

 others. The wandering of amoeboid cells in animal tissues, 

 brought into general notice by von Recklinghausen ^ (1863), 

 and the importance of this for many physiological and patho- 

 logical events in animal organisms was shown by this author, 

 and by Strieker, Cohnheim, and others. 



II. Physical and Chemical Properties of Contractile 

 Protoplasm. 



Contractile protoplasm appears optically as a homogeneous, 

 transparent, almost always colourless mass, with a higher 



theile in Zusammeuhang mit ihrer Genese betraclitet," ' Ztschr. f. wis. Zool,' 

 iv, p. 249, 1852 (translated from the 'Nederl. Lancet,' Derde, ser. i, pp. 84, 

 et seq., 1851-52). 



^ Max Schultze, ' Ueber den organismus der Polyopthalmien,' Leipzig, 

 1854. "Ueber innere Bewegungserscheinungen bei Diatomeen," 'Arch, f. 

 Anat. u. Physiol.,' 1858, p. 330. " Ueber Muskelkorperchen und das was man 

 einer Zelle zu nennen habe," ' Arch. f. Anat. u. Physiol.' 1861, p. 1 (in this 

 article the term protoplasm is transferred to the "contents " of animal cells)* 

 ' Das Protoplasma der Rhizopoden und der Pflanzenzellen,' Leipzig, 1863. 



^ F. Unger, ' Anatomic und Physiologic der Pfianzen.,' pp. 273 — 284, Pesth, 

 Wien und Leipzig, 1855. 



^ A. de Bary, "Die Mycetozoen," 'Ztschr, f. wis. Zool.,' x, pp. 88 — 175 

 (especially p. 121, et seq.), 1859, pis. vi — x. The second, considerably 

 enlarged, edition separately under the title 'Die Mycetozoen' (Schleimpiize) 

 Leipzig, 1864. 



'» E. H. Haeckel, 'Die Radiolarien,' Berlin, 1862 (specially p. 89, et seq.), 

 " Ueber den Sarkodckorper der Rliizopoden," ' Ztschr. f. wis, Zool.,' xv, p. 342, 

 1865, and many other memoirs, especially in the ' Jeuaische Zeitschrift.' 



* W. Kiihne, ' Untersuchungen iiber das Protoplasma und die Contractilitat,' 

 Leipzig, 1864; also 'Arch, f. Anat. and Physiol.,' 1859, pp. 564, 748. 



^ P. von Recklinghausen, " Ueber Eiter-und Biudegewebskorperchen, ' 

 'Arch. f. Path. Anat,,' xxviii, p, 157, pi, ii, 1863. 



