ADAPTATION 209 



the striped form, it has a certain suggestion of the striped arrange- 

 ment, such as I can well imagine being produced in the hetero- 

 zygote. 24 



In continuation 25 of the experiments on the colour of S. macu- 

 losa Kammerer publishes an account of elaborate experiments 

 in grafting ovaries of the various forms, modified and unmodified, 

 into each other, and describes the offspring which followed. 

 Before pursuing this part of the inquiry I am disposed to wait 

 until the earlier steps have been made much more secure than 

 they yet are. 



More recently Kammerer has published similar statements in 

 regard to the inheritance of characters induced in various lizards 

 by keeping them in abnormal temperatures, high and low. The 

 changes induced affected in some species the colours, in others 

 the reproductive habits. Respecting these examples I feel the 

 same scepticism that I have indicated in regard to the others, 

 somewhat heightened by the fact that insufficient evidence is 

 given both regarding the behaviour of these various species in 

 captivity when not subjected to abnormal temperatures, and 

 in the wild state. 



Respecting this part of the evidence Mr. G. A. Boulenger has 

 lately published a criticism 26 from which I extract the following 

 passages. Referring to a previous note 27 on the question of the 

 melanism of the various insular forms of Lacerta muralis he 

 writes: " I also alluded (/. c.) to the theories that have been 

 propounded to explain the melanism of various insular forms. 

 This is a subject which has been lately taken up by Dr. Kam- 

 merer at the Biologische Versuchsanstalt in Vienna, and he claims 

 to have produced nigrinos artificially by a very strong elevation 

 of the temperature, accompanied by extreme dryness. Dr. 

 Werner 28 has already opposed his own experiments to those of 

 Kammerer, artificial melanism having been produced by him in 

 Lacerta oxycephala by keeping two very light specimens from 



24 12 Flugschrift. Detit. Ges. Ziichtungskunde, 1910, Fig. 15, P. Reihe. 



25 Mendel Festschrift, 1911, p. 83. 



26 Field, 1912, 30 March. 



27 Ibid., 1904, p. 863. 



28 Mitth. Naturw. Ver. a. d. Univ. Wien, 1908, p. 53. 



IS 



