VARIOUS RESEARCHES 31 



ill question are now well known to be connected with 

 nitrogenous excretion. 



2. " On a Hermaphrodite and Fissiparous Species of 

 Tubicolar Annelida (Protula Dysteri) " (Edinburgh New 

 Philos. J., i, 1855, PP- l^3~-9- Sc'- Mem,, i, xxxiii, 

 p. 337). — This is a careful study of a marine worm, 

 presenting many points of interest to the specialist, 



3. "On the Structure of Noctiluca miliaris" (Q. J, 

 Micros. Soc, iii, 1 855, pp. 49-54- Sci. Mem., i, 

 XXXIV, p, 350- — ^^ have here a contribution to our 

 knowledge of an animalcule which is one of the causes of 

 the phosphorescence of the sea. 



4. "On the Enamel and Dentine of the Teeth" (op. 

 cit., iii, 1855, pp. 127-30, Sci. Mem,, i, xxxv, 

 p. 357)- — This is simply an answer to criticisms by 

 M. Edouard Lent on a previous paper. 



5. " Tegumentary Organs" (in Todd's Cyclopedia of 

 Anatomy and Physiology, published in the parts which 

 appeared between August 1855, and October 1856. Sci. 

 Mem., i, xxxviii, p. 365). — This classical comparative 

 study of the skin of animals marks, as Sir Michael Foster 

 has pointed out, that leaning to the physiological side 

 which circumstances prevented from having full play, and 

 which can be traced to the influence of Johannes MuUer. 

 That influence, however, and the equally potent one of 

 Von Baer, the father of embryology, deeply tinged a 

 very large part if not the whole of Huxley's scientiiic 

 work. 



6. " On Certain Zoological Arguments commonly Ad- 

 duced in Favour of the Hypothesis of the Progressive 

 Development of Animal Life in Time" (Abstract of a 

 Friday Evening Discourse delivered at the Royal Insti- 

 tution, April 20, 1855; Proc. Roy. Inst., ii, 1854-8, 

 pp. 82-5. Sci. Mem., i, xxviii, p. 300). — The lecture 



