20 PnOCF.EDTNnS OF 'inE 



^alainaiulers from the ITartz JNToiinlains were used, and they 

 showed iiiuiiediatcly after m('tainoi'{)hosiH, tlunr striped marking; 

 those ohtaiiK'd i'fom llt!i(k;ll)(,'rg were irreguhirly spotted, hut 

 arranged IhiMr luarUiiigs (hiring growth into iaiiiata. This 

 development is also revcrsihle ; Mr. E. (). Boulenger has confirmed 

 this, and has ohtained results i'ar more heautifui and significant 

 than those now under j-eview. 



If spotted and naturally striped Salamanders are crossed, Men- 

 delian characters are shown, tlie spots are dominant, the stripes 

 recessive. If one crosses naturally spotted Salamanders with 

 experimentally striped individuals, the hyhrids are intermediate in 

 character. 



If ovaries of si)olted females are fransplanted into naturally 

 striped ones, (he appearance of the young is determined hy the 

 true mother, not the foster-mother, and are irregularly spotted. 

 If on the other hand ovaries of spotted females are transplanted 

 into artificially striped ones, then, if tlie father is spotted, the 

 voung are line-spotted; if the father is striped, the young are 

 wholly striped. 



Success has heen obtained in developing the rudimentary eye of 

 Proteus into a full-sized functioning eye, by means of red light for 

 live years from birth. Exposure to ordinary daylight is not 

 effective, the skin which covers the rudimentary eye is tilled with 

 dark pigment sufficient to arrest the development of the eye, but 

 red light causes no ])igmeutation in the skin, and only under the 

 influence of this chemically inactive light is regression overcome. 



The develo])ment of the nuptial pad in the male Ahjtes, midwife 

 toad, which passes its mating period in water, is not found on 

 those individuals which mate on land, where no trace of a pad is 

 discernible, yet it can be made to appear by compelling them to 

 mate in water like other European batrachians. This is done by 

 raising tlie temperature, when the mating animnls stay longer in 

 the water than usual, otherwise they would be dried up ; later in 

 life compulsion is unnecessary, they take to water of their own 

 accord when desirous of mating. 



In 1914 experiments were carried out on the Ascidian, C'loua 

 ■i nf est i nails; if the siphons, the inhalent and exhalent tubes, are 

 cut oir, they grow larger than before; repeated amputations 

 produce specimens in which the siphons ju'esent a jointed appear- 

 ance. Tlie offspring of these individuals have longer siphons, but 

 the jointed appearance has been smoothed out; that is, the 

 regeneration is not transferred to the i)rogeny, l)ut the locally 

 increased intensity of growth is so. 



During tlie war the experimental animals whose peiligree was 

 known, and had been followed for fifteen years, were lost. 



Tiie President having opened the discussion, Prof. E. AV. 

 .MacBride, F.Jt.S. (visitoi-) explained that, as Prof. Ivammerer 

 would reply to any criticisms in (lermaii, he uould gladly act as 

 his interpreter. 



